不況【ふきょう】
depression, recession, slump
不足【ふそく】
insufficiency, deficiency, shortage, lack, scarcity, deficit, dissatisfaction, discontent, complaint
不満【ふまん】
dissatisfaction, discontent, displeasure, complaint, unhappiness
不明【ふめい】
unclear, obscure, indistinct, uncertain, ambiguous, unknown, unidentified, ignorance, lack of wisdom, lack of insight
不動産【ふどうさん】
real estate
不安【ふあん】
anxiety, uneasiness, worry, apprehension, fear, insecurity, suspense
不信【ふしん】
distrust, mistrust, disbelief, discredit, insincerity, impiety, faithlessness
不振【ふしん】
dullness, slump, stagnation, inactivity, depression
不透明【ふとうめい】
opaque, obscure, murky, turbid, opacity, obscurity, unclear, unpredictable, uncertain
不正【ふせい】
injustice, unfairness, wrongdoing, iniquity, impropriety, irregularity, dishonesty, illegality, fraud
不祥事【ふしょうじ】
scandal, impropriety, misconduct
不当【ふとう】
injustice, impropriety, unreasonableness, undeserved, unfair, invalid
不安定【ふあんてい】
instability, insecurity, crankiness
不十分【ふじゅうぶん】
insufficient, inadequate, imperfect
不法【ふほう】
unlawful, illegal, unreasonable, outrageous, unjust, unwarranted
不良【ふりょう】
bad, poor, inferior, defective, delinquent, hoodlum, hooligan
不在【ふざい】
absence, disregard, indifference
不可欠【ふかけつ】
indispensable, essential
不可能【ふかのう】
impossible
不自由【ふじゆう】
discomfort, inconvenience, poverty, want, destitution, inability, disability, impairment (physical, mental, etc.), nonfluency (in a language)