Webster's 1828 Dictionary
FOOLISHLY
adv. 1. Weakly; without understanding or judgment; unwisely; indiscreetly.
2. Wickedly; sinfully.
I have done very foolishly. 2 Samuel 24:1 .
Webster's 1913 Dictionary
FOOLISHLY
FOOLISHLY Fool "ish *ly, adv.
Defn: In a foolish manner.
New American Oxford Dictionary
foolishly
fool ish ly |ˈfo͞oliSHli | ▶adverb in an unwise manner; stupidly: they were condemned for acting foolishly | I foolishly wasted my money | foolishly, I decided to give it a go.
Oxford Dictionary
foolishly
fool |ish ¦ly |ˈfuːlɪʃli | ▶adverb in an unwise manner; stupidly: they were condemned for acting foolishly | I foolishly wasted my money | foolishly, I decided to give it a go.
Oxford Thesaurus
foolishly
foolishly adverb he'd be very cross with me if I acted foolishly: stupidly, idiotically, ineptly, inanely, senselessly, unwisely, ill-advisedly, incautiously, indiscreetly, short-sightedly; without thinking, without forethought; fatuously, absurdly; informal crazily; Brit. informal barmily.
Sanseido Wisdom Dictionary
foolishly
f ó ol ish ly 副詞 〖動詞 の前後で 〗愚かに, 浅はかに ; 〖文修飾 〗愚かにも .