• 不ふ

  un-, non-

• 不発ふはつ

  misfire

• 不要ふよう

  unnecessary, unneeded

• 不運ふうん

  misfortune, bad luck, ill luck, ill fortune

• 不詳ふしょう

  unknown, unidentified, unspecified

• 不仲ふなか

  discord, (on) bad terms (with)

• 不在ふざい

  absence

• 不全ふぜん

  partial, incomplete, imperfect

• 不妊ふにん

  infertility, sterility, barrenness

• 不意ふい

  sudden, abrupt, unexpected, unforeseen

• 不眠ふみん

  sleeplessness, insomnia, wakefulness

• 不況ふきょう

  (economic) depression, recession, slump

• 不便ふべん

  inconvenience, inexpediency, unhandiness

• 不審ふしん

  doubt, suspicion, question, strangeness

• 不敵ふてき

  daring, fearless, intrepid, bold, tough

• 不慮ふりょ

  unforeseen, unexpected, sudden, accidental

• 不倫ふりん

  adultery, impropriety, (an) affair, immorality

• 不吉ふきつ

  ominous, sinister, unlucky, inauspicious

• 不屈ふくつ

  persistence, fortitude, indomitability

• 不純ふじゅん

  impure, adulterated, foul, mixed, dishonest

• 不利ふり

  disadvantage, handicap, unfavorable position

• 不平ふへい

  discontent, dissatisfaction, complaint, grievance

• 不振ふしん

  dullness, slump, stagnation, inactivity, depression

• 不通ふつう

  suspension, interruption, stoppage, tie-up, cessation

• 不順ふじゅん

  irregular, unseasonable, changeable, unsettled, abnormal

• 不評ふひょう

  bad reputation, poor reception, unpopularity, disrepute

• 不定ふじょう

  uncertainty, insecurity, inconstancy, indefinite, undecided

• 不図ふと

  suddenly, casually, accidentally, incidentally, unexpectedly, unintentionally

• 不備ふび

  defect, deficiency, imperfection, inadequacy, lack

• 不徳ふとく

  lack of virtue, immorality, vice, depravity, unworthiness

• 不朽ふきゅう

  everlasting, immortal, eternal, enduring, undying, imperishable

• 不穏ふおん

  disquieting, threatening, turbulent, restless, unsettled, disturbing

• 不良ふりょう

  bad, poor, inferior, defective

• 不快ふかい

  displeasure, discomfort, unpleasantness

• 不満ふまん

  dissatisfaction, discontent, displeasure, complaint, unhappiness

• 不法ふほう

  unlawful, illegal

• 不信ふしん

  distrust, mistrust, disbelief, discredit

• 不安ふあん

  anxiety, uneasiness, worry, apprehension, fear, insecurity, suspense

• 不和ふわ

  discord, trouble, dissension, disagreement, friction, conflict, feud, bad terms

• 不毛ふもう

  barren, sterile, infertile

• 不作ふさく

  poor crop, bad harvest, crop failure

• 不服ふふく

  dissatisfaction, discontent, disapproval, objection, complaint, protest, disagreement

• 不浄ふじょう

  unclean, dirty, impure

• 不問ふもん

  not asking (about), letting go unquestioned, disregarding, ignoring, overlooking

• 不戦ふせん

  war renunciation, anti-war

• 不当ふとう

  unfair, unjust, wrongful, improper, unreasonable, unwarranted, unjustified, undeserved, undue

• 不潔ふけつ

  unclean, dirty, unsanitary, filthy

• 不可ふか

  wrong, bad, improper, unjustifiable, inadvisable

• 不足ふそく

  insufficiency, deficiency, shortage, lack, scarcity, deficit

• 不孝ふこう

  undutifulness to one's parents, lack of filial piety