Etymology
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foolish (adj.)

early 14c., from fool (n.1) + -ish. Older adjectives in Middle English were fool (c. 1200); folly (c. 1300). Old English words for this were dysig, stunt, dol. Related: Foolishly; foolishness.

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Definitions of foolish

foolish (adj.)
devoid of good sense or judgment;
foolish remarks
a foolish decision
foolish (adj.)
having or revealing stupidity;
Synonyms: anserine / dopy / dopey / goosey / goosy / gooselike / jerky
From wordnet.princeton.edu