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ludicrous, foolish;
"gave me a cockamamie reason for not going"
"wore a goofy hat"
"a silly idea"
"some wacky plan for selling more books"
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lacking seriousness; given to frivolity;
"a dizzy blonde"
"light-headed teenagers"
"silly giggles"
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inspiring scornful pity;
"how silly an ardent and unsuccessful wooer can be especially if he is getting on in years"
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dazed from or as if from repeated blows;
"knocked silly by the impact"
"slaphappy with exhaustion"