| term | pronunciation | English |
|---|
| 不 | フ、ブ | un-, not, negation, bad, dis- |
| 不便 | ふべん | inconvenient; not useful |
| 不便な | ふべんな | inconvenient |
| 不利 | ふり | disadvantage, handicap, unfavorable, drawback |
| 不可 | ふか | wrong, bad, improper, unjustifiable, inadvisable |
| 不吉 | ふきつ | bad omen |
| 不味い | まずい | unpleasant (taste) |
| 不安 | ふあん | unease |
| 不平 | ふへい | complaint, discontent, dissatisfaction |
| 不幸 | ふこう | unhappiness, sorrow, misfortune, disaster, accidental |
| 不明 | ふめい | unclear |
| 不正 | ふせい | injustice, unfairness |
| 不気味 | ぶきみ | weird |
| 不満 | ふまん | dissatisfaction, displeasure, discontent, complaint |
| 不潔 | ふけつ | unclean, dirty, filthy, impure |
| 不自由 | ふじゆう | discomfort, disability, inconvenience, destitution |
| 不規則 | ふきそく | irregularity, unsteadiness, disorderly |
| 不思議 | ふしぎ | mystery, curiosity |
| 不足 | ふそく | insufficiency; shortage |
| 不通 | ふつう | suspension, interruption, stoppage, tie-up |
| 不運 | ふうん | unlucky, misfortune, bad luck, fate |
| 不仲 | ふなか | discord |
| 不信 | ふしん | unfaithfulness, insincerity, perfidy, mistrust, distrust, discredit |
| 不信任 | ふしんにん | non-confidence, lack of confidence |
| 不倒翁 | おきあがりこぼし | tumbler, self-righting toy |
| 不倫 | ふりん | adultery, immorality, impropriety |
| 不偏不党 | ふへんふとう | impartiality, neutrality, independence |
| 不健康 | ふけんこう | poor health, ill health, unhealthy |
| 不動産 | ふどうさん | real estate |
| 不可侵 | ふかしん | inviolability, sacredness, nonaggression |
| 不可分 | ふかぶん | atomic, indivisibility |
| 不可欠 | ふかけつ | indispensable, essential |
| 不可能 | ふかのう | impossible |
| 不可避 | ふかひ | inevitable, inescapable, unavoidable |
| 不名誉 | ふめいよ | dishonor, dishonour, disgrace, shame |
| 不在 | ふざい | absence |
| 不均衡 | ふきんこう | imbalance, disparity, out of balance, inequality |
| 不妊 | ふにん | infertility, sterility, barrenness |
| 不妊症 | ふにんしょう | infertility, sterility, barrenness |
| 不安定 | ふあんてい | instability, insecurity, crankiness |
| 不完全 | ふかんぜん | imperfect, incomplete, faulty, defective |
| 不屈 | ふくつ | persistence, fortitude, indomitability |
| 不履行 | ふりこう | default, nonperformance |
| 不平等 | ふびょうどう | inequality, unequal (treaties), unfair |
| 不徳 | ふとく | lack of virtue, immorality, vice, depravity, unworthiness |
| 不徹底 | ふてってい | inconsistent, illogical, unconvincing, not thorough, indefinite, half-way |
| 不必要 | ふひつよう | unnecessary, undesired |
| 不快 | ふかい | unpleasant, displeasure, discomfort |
| 不愉快 | ふゆかい | discomfort, unpleasantness, disagreeableness, unhappiness |
| 不慣れ | ふなれ | inexperience, lack of experience |
| 不慮 | ふりょ | unforeseen, accidental |
| 不払い | ふばらい | nonpayment, default |
| 不振 | ふしん | dullness, depression, slump, stagnation |
| 不整脈 | ふせいみゃく | irregular pulse, arrhythmia |
| 不明朗 | ふめいろう | gloominess, gloom; questionable, unfair, underhand |
| 不明瞭 | ふめいりょう | dimness, obscurity, indistinctness, unclear, unintelligible |
| 不景気 | ふけいき | business recession, hard times, depression, gloom, sullenness, cheerlessness |
| 不智 | ふち | something unknown; ignorance, foolishness |
| 不朽 | ふきゅう | everlasting, immortal, eternal, immortality, imperishable |
| 不朽の名作 | ふきゅうのめいさく | immortal work |
| 不毛 | ふもう | sterile, barren, unproductive, sour |
| 不況 | ふきょう | recession, depression, slump |
| 不滅 | ふめつ | immortal, undying, indestructible |
| 不燃 | ふねん | incombustibility |
| 不眠 | ふみん | sleeplessness, insomnia, wakefulness |
| 不眠症 | ふみんしょう | sleeplessness, insomnia, wakefulness |
| 不祥 | ふしょう | disgraceful, inauspicious, ill-omened, ominous, scandalous |
| 不祥事 | ふしょうじ | scandal, deplorable event |
| 不穏 | ふおん | unrest, turbulence, impropriety |
| 不穏分子 | ふおんぶんし | disturbing elements |
| 不穏当 | ふおんとう | impropriety, inappropriateness, unfairness, unreasonableness |
| 不純物 | ふじゅんぶつ | foreign matter, impurities |
| 不羈奔放 | ふきほんぽう | free-spirited and uninhibited |
| 不自然 | ふしぜん | unnatural, artificial, affected, strained |
| 不良 | ふりょう | badness, inferiority, delinquency, failure, defect, blemish |
| 不虞 | ふぐ | emergency |
| 不行き届き | ふゆきとどき | negligence, carelessness, incompetence, mismanagement |
| 不詳 | ふしょう | unknown, unidentified, unspecified |
| 不謹慎 | ふきんしん | indiscretion, imprudence |
| 不起訴 | ふきそ | nonprosecution or indictment |
| 不透明 | ふとうめい | opacity |
| 不遇 | ふぐう | misfortune, bad luck, obscurity |
| 優柔不断 | ゆうじゅうふだん | shilly-shally, indecisiveness |
| 公的不法妨害 | こうてきふほうぼうがい | public nuisance |
| 己所不欲勿施於人 | おのれのほっせざるところひとにほどこすことなかれ | don't do unto others what you would not have done unto you |
| 心不全 | しんふぜん | heart failure |
| 理不尽 | りふじん | unreasonable, irrational |
| 稔実不良 | ねんじつふりょう | poor crop (of rice) |
| 肢体不自由児 | したいふじゆうじ | handicapped child |
| 食糧不足 | しょくりょうふそく, しょくりょうぶそく | food shortage |