unwise

adjective

characterized as lacking wisdom

Wiktionary

Pronunciation: /ʌnˈwaɪz/

adj

Etymology: From Middle English unwis, from Old English unwīs (“unwise, foolish, ignorant, uninformed, insane”), equivalent to un- + wise. Cognate with Dutch onwijs (“unwise”), German unweise (“unwise”), Danish uvis (“unwise”), Swedish ovis (“unwise”), Icelandic óvís (“unwise”).

Not wise; lacking wisdom
“unwise man”
“unwise kings”