Etymology
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unwise (adj.)

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.

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Definitions of unwise

unwise (adj.)
showing or resulting from lack of judgment or wisdom;
an unwise investor is soon impoverished
unwise (adj.)
not appropriate to the purpose;
Synonyms: inexpedient
From wordnet.princeton.edu