unwisely adv. + Add to list US //ənˈwaɪzɫi// UK //ʌnwˈaɪzli// un·wise·ly SynonymsAntonymsEtymology Synonyms foolishly Antonyms wiselyOriginOEunwīslīċe→MEvnwysely→ENunwisely From Middle English vnwysely, vnwisely, vnwyseliche, from Old English unwīslīċe (“unwisely, foolish”), equivalent to un- + wisely.