/ ˌʌnˈwaɪz; NAmE / adjective
unwise (to do sth) showing a lack of good judgement
SYN foolish :
It would be unwise to comment on the situation without knowing all the facts.
an unwise investment
OPP wise
► un·wise·ly adverb :
Perhaps unwisely, I agreed to help.
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WORD ORIGIN
Old English unwīs (see un- , wise ).