Crossword Dictionary

UNWISE

unwise - a 
showing or resulting from lack of judgment or wisdom; "an unwise investor is soon impoverished" 

wordplays

Synonyms

absurd, asinine, balmy, brainless, bubbleheaded, cockeyed, crackpot, crazy, cuckoo, daffy, daft, dippy, dotty, fatuous, featherheaded, fool, foolish, half-baked, half-witted, harebrained, inept, insane, jerky, kooky (also kookie), loony (also looney), lunatic, lunkheaded, mad, nonsensical, nutty, preposterous, sappy, screwball, senseless, silly, simpleminded, stupid, tomfool, wacky (also whacky), weak-minded, witless, zany

merriam-webster

Examples

“At the same time it should be remembered that many points await elucidation, and it is unwise to assume conclusions in advance of the evidence.”

“It never got beyond that rehearsal; Hume, indeed, approved of the performance, only deprecating as unwise the author's preference for French; but Gibbon sided with the majority.”

“Except on extremely heavy soils or on shallow soils with a subsoil which it is unwise to bring upon the surface, the modern tendency is in favour of the digging plough.”

yourdictionary

Etymology

Old English unwis, from un- (1) "not" + wise (adj.). Similar formation in Middle Dutch onwijs, Old High German unwis, German unweise, Old Norse uviss, Gothic unweis.

etymonline