Open English Wordnet
Adjectives
(a)foolishdevoid of good sense or judgment“foolish remarks”,
“a foolish decision” (s)anserine, dopy, dopey, foolish, goosey, goosy, gooselike, jerkyhaving or revealing stupidity“ridiculous anserine behavior”,
“a dopey answer”,
“a dopey kid”,
“some fool idea about rewriting authors' books”