unwise

adjective, un·wis·er, un·wis·est.

1. not wise; foolish; imprudent; lacking in good sense or judgment: an unwise choice; an unwise man.

adjective

1. lacking wisdom or prudence; foolish

adj.Old English unwis, from un- (1) “not” + wise (adj.). Cf. Middle Dutch onwijs, Old High German unwis, German unweise, Old Norse uviss, Gothic unweis.