不悪[ashikarazu] don't get me wrong, but ...
意識不明[ishikifumei] unconscious
一心不乱[isshinfuran] wholeheartedly
一定不変[itteifuhen] invariable
運動不足[undoubusoku] insufficient exercise

栄養不足[eiyoubusoku] malnutrition
過不足[kafusoku] excess or deficiency
回復不可能[kaifukufukanou] non-recoverable
気不味い[kimazui] unpleasant
健康不安[kenkoufuan] poor health

不逞[futei] insubordination
逞しい[takumashii] burly
不逞の輩[futeinoyakara] lawless people

逞しくする[takumashikusuru] to give rein to
逞しゅうする[takumashuusuru] to give rein to