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.
foolish remarks
a foolish decision
foodstuff
fool
foolery
foolhardy
fooling
foolish
foolishness
foolocracy
fool-proof
foolscap
foosball
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