2.3 Compound Words, Prefixes & Suffixes (接頭語・接尾語)

2.3 Compound Words, Prefixes & Suffixes (接頭語・接尾語)

At the JLPT N3 level, the Japanese lexicon expands dramatically through morphological word formation (造語法 zōgohō). Instead of learning thousands of isolated terms, mastering how prefixes (接頭語 settōgo), suffixes (接尾語 setsubigo), and compound verbs (複合動詞 fukugō dōshi) attach to base words allows you to decode unfamiliar vocabulary instantly during the exam.

N3 has no dedicated word-formation block: the 語形成 Mondai exists only on the N2. At N3, prefix, suffix, and compound-verb knowledge is examined indirectly — inside 問題3 (文脈規定), 問題4 (言い換え類義) and 問題5 (用法), in the kanji items, and as pivotal lexical anchors in reading passages.

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1. Negative Prefixes: The Nuance Discrimination Matrix

One of the most heavily tested areas on the JLPT N3 is distinguishing between the four primary negative prefixes: 無- (む-), 不- (ふ-), 非- (ひ-), and 未- (み-). While all four translate roughly as "un-", "non-", or "in-" in English, each carries a distinct semantic domain and strict collocational constraints.

┌─────────────────────────────────────────────────────────────┐
│                 The Four Negative Prefixes                  │
│                                                             │
│  1. 無- (む- / mu-) ──► Complete absence, zero existence    │
│     Key Words: 無責任 (irresponsible), 無料 (free of charge)│
│                無意味 (meaningless), 無関係 (unrelated)     │
│                                                             │
│  2. 不- (ふ- / fu-) ──► Bad quality, insufficiency, opposite│
│     Key Words: 不安 (anxious/uneasy), 不可能 (impossible)   │
│                不便 (inconvenient), 不足 (insufficient)     │
│                                                             │
│  3. 非- (ひ- / hi-) ──► Categorical violation, non-belonging│
│     Key Words: 非常識 (lacking common sense), 非公式 (unofficial)│
│                非科学的 (unscientific), 非公開 (private)    │
│                                                             │
│  4. 未- (み- / mi-) ──► Not yet occurred (future expected) │
│     Key Words: 未完成 (incomplete), 未成年 (underage/minor) │
│                未定 (undecided), 未解決 (unresolved)        │
└─────────────────────────────────────────────────────────────┘

Systematic Breakdown of Negative Prefixes:

1. 無- (む- mu-): Absence or Zero Quantity
   • Meaning: Indicates that a feature, entity, or value does not exist at all (0%).
   • High-Yield Compounds:
     • 無責任 (むせきにん musekinin - irresponsible)
     • 無料 (むりょう muryō - free of charge)
     • 無意味 (むいみ muimi - meaningless / futile)
     • 無関係 (むかんけい mukankei - unrelated / irrelevant)
     • 無意識 (むいしき muishiki - unconscious / involuntary)
     • 無駄 (むだ muda - wasteful / useless)
2. 不- (ふ- fu- / ぶ- bu-): Negative State, Badness, or Defect
   • Meaning: Negates the positive quality of an adjective or noun; expresses imperfection, inadequacy, or dissatisfaction.
   • High-Yield Compounds:
     • 不安 (ふあん fuan - anxiety / uneasy state)
     • 不可能 (ふかのう fukanō - impossible)
     • 不便 (ふべん fuben - inconvenient)
     • 不満 (ふまん fuman - dissatisfied / discontent)
     • 不足 (ふそく fusoku - shortage / lack)
     • 不正 (ふせい fusei - injustice / dishonesty / fraud)
     • 不器用 (ぶきよう bukiyō - clumsy / awkward)
3. 非- (ひ- hi-): Outside Category, Contradiction to Logic or Nature
   • Meaning: Formally classifies something as not belonging to a category or as defying accepted societal/natural principles.
   • High-Yield Compounds:
     • 非常識 (ひじょうしき hijōshiki - lack of common sense)
     • 非公式 (ひこうしき hikōshiki - unofficial / informal)
     • 非科学的 (ひかがくてき hikagakuteki - unscientific)
     • 非公開 (ひこうかい hikōkai - closed to public / private)
     • 非売品 (ひばいひん hibaihin - not for sale / promotional item)
4. 未- (み- mi-): Temporal Incompletion ("Not Yet")
   • Meaning: Denotes that an expected action, developmental milestone, or decision has not yet been achieved, but is anticipated.
   • High-Yield Compounds:
     • 未完成 (みかんせい mikansei - incomplete / work in progress)
     • 未成年 (みせいねん miseinen - minor / underage person)
     • 未定 (みてい mitei - undecided / pending)
     • 未解決 (みかいけつ mikaiketsu - unresolved / unsettled)
     • 未払い (みはらい miharai - unpaid invoice/bill)
     • 未知 (みち michi - the unknown)

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2. Other High-Yield N3 Prefixes

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3. High-Yield N3 Suffixes (接尾語 Setsubigo)

A. The Cost Suffix Quad: -料 vs. -費 vs. -代 vs. -賃

Distinguishing between the four Japanese financial and cost suffixes is a recurring question on N3 vocabulary tests:

┌─────────────────────────────────────────────────────────────┐
│                     The Cost Suffix Matrix                  │
│                                                             │
│  1. -料 (りょう / ryō)  ──► Fee for a service, right, entry │
│     Examples: 入場料 (admission), 授業料 (tuition), 手数料 (fee)│
│                                                             │
│  2. -費 (ひ / hi)       ──► Operating expenses, budgets    │
│     Examples: 生活費 (living cost), 交通費 (travel exp), 会費│
│                                                             │
│  3. -代 (だい / dai)    ──► Direct payment for goods/utility│
│     Examples: 食事代 (meal bill), 電気代 (electricity), 部屋代│
│                                                             │
│  4. -賃 (ちん / chin)   ──► Fare for transit or manual labor│
│     Examples: 運賃 (transit fare), 家賃 (rent), 手間賃 (labor)│
└─────────────────────────────────────────────────────────────┘

• -料 (りょう ryō): Service, Admission, or Usage Fee
  • Collocations: 入場料 (admission fee), 授業料 (tuition fee), 手数料 (service/handling fee), 使用料 (rental/usage fee), 診察料 (medical examination fee).
• -費 (ひ hi): Broad Expense Categories, Budgets, and Operating Funds
  • Collocations: 生活費 (living expenses), 交通費 (transportation budget/expense), 会費 (membership dues), 学費 (schooling expenses), 医療費 (medical expenses), 光熱費 (utility expenses).
• -代 (だい dai): Commodity Charges, Consumables, and Everyday Utility Bills
  • Collocations: 食事代 (meal cost/bill), 電気代 (electricity bill), ガス代 (gas bill), 電話代 (telephone bill), タクシー代 (taxi bill), 本代 (book money).
• -賃 (ちん chin): Fares for Transport, Leased Space, and Physical Labor
  • Collocations: 運賃 (passenger transit/freight fare), 家賃 (house/apartment rent), 電車賃 (train fare), 手間賃 (labor compensation), 船賃 (boat fare).

B. Derivational Abstract Suffixes

• -的 (-てき -teki): Converts nouns into na-adjectives indicating a general nature or characteristic.
  • Examples: 具体的 (concrete), 抽象的 (abstract), 積極的 (proactive), 消極的 (passive), 基本的 (fundamental), 効果的 (effective).
• -化 (-か -ka): Corresponds to English -ization / -ification; indicates a process of transformation into a state.
  • Examples: 温暖化 (global warming), 高齢化 (population aging), 国際化 (internationalization), 映画化 (film adaptation), 実用化 (commercial application).
• -性 (-せい -sei): Corresponds to English -ity / -ness; denotes an inherent quality, tendency, or capacity.
  • Examples: 可能性 (possibility), 安全性 (safety), 危険性 (danger), 重要性 (importance), 必要性 (necessity), 信頼性 (reliability).
• -感 (-かん -kan): Denotes a psychological feeling, impression, or atmosphere.
  • Examples: 安心感 (sense of relief/security), 責任感 (sense of responsibility), 満足感 (sense of satisfaction), 危機感 (sense of crisis), 季節感 (feeling of the season).

C. Aspectual and State Suffixes

• -立て (-たて -tate): "Freshly / just completed" (attached directly to verb masu-stems).
  • Examples: 焼きたて (freshly baked), 炊きたて (freshly cooked rice), 淹れたて (freshly brewed coffee), 出来立て (freshly made).
• -気味 (-ぎみ -gimi): "Slight tendency toward / a touch of" (usually attached to unwanted physical or emotional states).
  • Examples: 風邪気味 (a slight cold), 疲れ気味 (feeling slightly fatigued), 太り気味 (slightly gaining weight), 遅れ気味 (running slightly late).
• -がち (-gachi): "Frequently prone to / tending to" (expresses an undesirable repeated tendency).
  • Examples: 留守がち (often away from home), 忘れがち (prone to forgetting), 遅刻しがち (tending to arrive late), 遠慮しがち (tending to be overly reserved).
• -っぽい (-ppoi): "-ish, -like, resembling, or easily triggered".
  • Examples: 子供っぽい (childish), 怒りっぽい (quick-tempered), 安っぽい (cheap-looking), 忘れっぽい (forgetful).

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4. Compound Verbs (複合動詞 Fukugō Dōshi)

Compound verbs are formed by attaching an auxiliary verb to the masu-stem (連用形 ren'yōkei) of a primary verb. The secondary verb modifies the aspect, direction, or completion of the main action.

┌─────────────────────────────────────────────────────────────┐
│                    Compound Verb Anatomy                    │
│                                                             │
│  [ Primary Verb Masu-Stem ]  +  [ Auxiliary Verb ]          │
│   Example: 降り (furi)       +  出す (dasu)   = 降り出す    │
│            (rain)            +  (start/out)   = start rain  │
│                                                             │
│   Example: 考え (kangae)     +  直す (naosu)  = 考え直す    │
│            (think)           +  (repair/redo) = reconsider  │
│                                                             │
│   Example: 読み (yomi)       +  切る (kiru)   = 読み切る    │
│            (read)            +  (cut/exhaust) = finish read │
└─────────────────────────────────────────────────────────────┘

The Master N3 Compound Verb Reference:

1. 〜出す (-dasu): Sudden Inception or Outward Motion
   • 降り出す (furidasu - suddenly start raining)
   • 走り出す (hashiridasu - burst into a run)
   • 泣き出す (nakidasu - burst into tears)
   • 取り出す (toridasu - take out / pull out from inside)
   • 思い出す (omoidasu - recall / remember)
2. 〜直す (-naosu): Redoing to Improve, Correct, or Re-evaluate
   • 書き直す (kakinaosu - rewrite / revise text)
   • やり直す (yarinaosu - redo an action from scratch)
   • 考え直す (kangaenaosu - reconsider a decision)
   • 見直す (minaosu - re-examine / review / look over again)
3. 〜込む (-komu): Inward Motion, Deep Insertion, or Total Absorption
   • 飛び込む (tobikomu - jump into / dive into water or train)
   • 落ち込む (ochikomu - fall into depression / feel down)
   • 思い込む (omoikomu - be firmly convinced of / wrongly assume)
   • 詰め込む (tsumekomu - cram into / stuff tightly)
   • 溶け込む (tokekomu - melt into / blend harmoniously into society)
4. 〜切る (-kiru): Exhaustive Completion or Reaching an Extreme State
   • 使い切る (tsukaikiru - use up completely / exhaust supply)
   • 読み切る (yomikiru - read a book completely to the end)
   • 疲れ切る (tsukarekiru - be completely exhausted / worn out)
   • 言い切る (iikiru - state definitively / declare without hesitation)
5. 〜通す (-tōsu): Continuing an Action Relentlessly to the End
   • やり通す (yaritōsu - carry through to completion despite hardships)
   • 走り通す (hashiritōsu - run the entire distance without stopping)
   • 守り通す (mamoritōsu - protect a secret/promise to the very end)
6. 〜掛ける / 〜掛かる (-kakeru / -kakaru): Incomplete Action or On the Verge of
   • 話し掛ける (hanashikakeru - initiate conversation with someone)
   • 食べ掛ける (tabekakeru - leave food half-eaten)
   • 倒れ掛かる (taorekakaru - be on the verge of collapsing)
7. 〜忘れる (-wasureru): Forgetting to Perform an Action
   • 書き忘れる (kakiwasureru - forget to write down)
   • 閉め忘れる (shimewasureru - forget to close the door/window)
   • 買い忘れる (kaiwasureru - forget to buy an item)
8. 〜過ぎる (-sugiru): Excessive, Extreme Degree
   • 食べ過ぎる (tabesugiru - overeat)
   • 飲み過ぎる (nomisugiru - drink excessively)
   • 考え過ぎる (kangaesugiru - overthink / worry excessively)
9. 〜合わせる (-awaseru): Unification, Matching, or Mutual Action
   • 話し合う (hanashiau - discuss mutually)
   • 問い合わせる (toiawaseru - contact for inquiry)
   • 待ち合わせる (machiawaseru - meet up at a prearranged place)

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5. Exhaustive Reference Table of Affixes & Collocational Restrictions