| 不思議 | ふしぎ | wonderful; marvelous; strange; incredible | n4 |
| 不安 | ふあん | anxiety; uneasiness; worry; apprehension | n4 |
| 不幸 | ふこう | unhappiness; sorrow; misfortune; disaster | n1 |
| 不足 | ふそく | insufficiency; deficiency; shortage; lack | n3 |
| 不意 | ふい | sudden; abrupt; unexpected; unforeseen | n2 |
| 不明 | ふめい | unclear; obscure; indistinct; uncertain | n2 |
| 不可能 | ふかのう | impossible | n2 |
| 不自由 | ふじゆう | discomfort; inconvenience; poverty; want | n2 |
| 不審 | ふしん | doubt; suspicion; question; strangeness | n1 |
| 不平 | ふへい | discontent; dissatisfaction; complaint; grievance | n2 |
| 不快 | ふかい | displeasure; discomfort; unpleasantness; indisposition | n2 |
| 不満 | ふまん | dissatisfaction; discontent; displeasure; complaint | n4 |
| 不愉快 | ふゆかい | unpleasant; disagreeable; displeasing; uncomfortable | n2 |
| 不自然 | ふしぜん | unnatural; artificial; affected; strained | n2 |
| 不便 | ふべん | inconvenience; inexpediency; unhandiness | n4 |
| 不気味 | ぶきみ | weird; eerie; ominous; creepy | |
| 不断 | ふだん | constant; persistent; unremitting; ceaseless | n3 |
| 不動産 | ふどうさん | real estate | n3 |
| 不良 | ふりょう | bad; poor; inferior; defective | n2 |
| 不都合 | ふつごう | inconvenient; inexpedient; unfavourable; troublesome | n2 |
| 不可 | ふか | wrong; bad; improper; unjustifiable | n2 |
| 不在 | ふざい | absence; disregard; indifference | n1 |
| 不機嫌 | ふきげん | pout; displeasure; ill humor; ill humour | n1 |
| 不要 | ふよう | unnecessary; unneeded | n3 |
| 不吉 | ふきつ | ominous; sinister; unlucky; inauspicious | |
| 不可思議 | ふかしぎ | mystery; something inexplicable; wonder; miracle | |
| 不動 | ふどう | immovable; motionless; firm; unwavering | |
| 不正 | ふせい | injustice; unfairness; wrongdoing; iniquity | n1 |
| 不服 | ふふく | dissatisfaction; discontent; disapproval; objection | n1 |
| 不十分 | ふじゅうぶん | insufficient; inadequate; imperfect | n2 |
| 不覚 | ふかく | failure; defeat; mistake; blunder | |
| 不運 | ふうん | misfortune; bad luck; ill luck; ill fortune | |
| 不可解 | ふかかい | incomprehensible; mysterious; inexplicable; inscrutable | n1 |
| 不当 | ふとう | unfair; unjust; wrongful; improper | n1 |
| 不利 | ふり | disadvantage; handicap; unfavorable position | n1 |
| 不完全 | ふかんぜん | imperfect; incomplete; faulty; defective | n2 |
| 不具 | ふぐ | deformity; distortion; disability; cripple | |
| 不潔 | ふけつ | unclean; dirty; unsanitary; filthy | |
| 不景気 | ふけいき | economic slump; hard times; depression; recession | n1 |
| 不器用 | ぶきよう | clumsy; awkward; unskillful; incompetent | n1 |
| 不敵 | ふてき | daring; fearless; intrepid; bold | n1 |
| 不義 | ふぎ | immorality; injustice; misconduct; impropriety | |
| 不用 | ふよう | disused; unused; useless; wasteful | n3 |
| 不 | ふ | un-; non- | n3 |
| 不用意 | ふようい | unprepared; careless; imprudent; indiscreet | n1 |
| 不憫 | ふびん | poor; pitiful; piteous; pitiable | |
| 不規則 | ふきそく | irregular; unsystematic; unsteady; disorderly | n3 |
| 不純 | ふじゅん | impure; adulterated; foul; mixed | n2 |
| 不安定 | ふあんてい | instability; insecurity; crankiness | n2 |
| 不注意 | ふちゅうい | carelessness; inattention; thoughtlessness; negligence | n1 |
| 不調和 | ふちょうわ | disharmony; discord; dissonance; incongruity | |
| 不合理 | ふごうり | irrational; illogical; unreasonable; absurd | |
| 不精 | ぶしょう | indolence; laziness; sloth | |
| 不変 | ふへん | eternal; everlasting; unchangeable; immutable | n1 |
| 不遇 | ふぐう | misfortune; ill fate; bad luck; obscurity | n2 |
| 不倫 | ふりん | adultery; impropriety; (an) affair; immorality | n1 |
| 不滅 | ふめつ | immortal; undying; indestructible | |
| 不埒 | ふらち | lawless; outrageous; insolent; rude | |
| 不孝 | ふこう | undutifulness to one's parents; lack of filial piety; (the crime of) cursing one's parents; disowning one's child | n1 |
| 不可欠 | ふかけつ | indispensable; essential | n2 |
| 不穏 | ふおん | disquieting; threatening; turbulent; restless | n1 |
| 不知 | ふち | being unknown; not knowing; ignorance; foolishness | n1 |
| 不眠 | ふみん | sleeplessness; insomnia; wakefulness | |
| 不浄 | ふじょう | unclean; dirty; impure; bathroom | |
| 不能 | ふのう | impossible; incapable (of doing); unable (to do); incompetence | n1 |
| 不味い | まずい | bad(-tasting); unpalatable; unsavoury; unsavory | n5 |
| 不和 | ふわ | discord; trouble; dissension; disagreement | |
| 不名誉 | ふめいよ | dishonor; dishonour; disgrace; shame | |
| 不条理 | ふじょうり | absurd; irrational; unreasonable; illogical | |
| 不朽 | ふきゅう | everlasting; immortal; eternal; enduring | n2 |
| 不信 | ふしん | distrust; mistrust; disbelief; discredit | n1 |
| 不心得 | ふこころえ | indiscretion; imprudence; rudeness; misbehavior | |
| 不調 | ふちょう | bad condition; poor condition; disorder; slump | n3 |
| 不備 | ふび | defect; deficiency; imperfection; inadequacy | n1 |
| 不肖 | ふしょう | unworthy (of one's father, teacher, etc.); I; me; incompetent | n1 |
| 不充分 | ふじゅうぶん | insufficient; inadequate; imperfect | n2 |
| 一心不乱 | いっしんふらん | wholeheartedly; with heart and soul; intently; with undivided attention | |
| 不公平 | ふこうへい | unfairness; injustice; partiality | n2 |
| 不案内 | ふあんない | ignorance; inexperience; unfamiliarity | |
| 不徳 | ふとく | lack of virtue; immorality; vice; depravity | |
| 不通 | ふつう | suspension; interruption; stoppage; tie-up | n4 |
| 不慮 | ふりょ | unforeseen; unexpected; sudden; accidental | n1 |
| 不利益 | ふりえき | disadvantage; handicap; drawback; inadvisability | n1 |
| 不如意 | ふにょい | contrary to one's wishes; gone awry; gone amiss; short of money | |
| 不遜 | ふそん | haughty; arrogant; insolent; presumptuous | |
| 不相応 | ふそうおう | unsuited; inappropriate; improper; undeserved | |
| 不興 | ふきょう | displeasure; ill humour; ill humor; pique | n1 |
| 不恰好 | ぶかっこう | unshapely; ill-formed; misshapen; awkward | |
| 不承知 | ふしょうち | dissent; disagreement; disapproval; objection | |
| 不法 | ふほう | unlawful; illegal; unreasonable; outrageous | |
| 不作法 | ぶさほう | ill-mannered; rude | |
| 不仕合せ | ふしあわせ | unhappiness; misfortune; ill luck | |
| 不屈 | ふくつ | persistence; fortitude; indomitability | |
| 不振 | ふしん | dullness; slump; stagnation; inactivity | n1 |
| 不人情 | ふにんじょう | unkindness; inhumanity; heartlessness | |
| 不明瞭 | ふめいりょう | unclear; indistinct; obscure; opaque | |
| 不親切 | ふしんせつ | unkindness; unfriendliness | |
| 不満足 | ふまんぞく | dissatisfaction; discontent; displeasure | |
| 不賛成 | ふさんせい | disapproval; disagreement | |
| 不問 | ふもん | not asking (about); letting go unquestioned; disregarding; ignoring | |