adj
foolish
FOO-lihsh
adj
1
Lacking good sense; unwise or silly.
"It was foolish to leave the door unlocked overnight."
"He felt foolish after realizing his mistake."
How to Use Foolish
Learner’s notesIn plain EnglishNot smart or sensible; the way a fool would act.
Common pairings
feel foolish
a foolish mistake
foolish decision
Word Forms
more foolish comparative, most foolish superlative
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It was _____ to leave the door unlocked overnight.
Etymology
From Middle English folisch, built from fool + -ish.