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Dictionary definition
· silly
noun
a word used for misbehaving children
"don't be a silly"
adjective
ludicrous, foolish
"wore a goofy hat"
lacking seriousness; given to frivolity
"a dizzy blonde"
inspiring scornful pity
"how silly an ardent and unsuccessful wooer can be especially if he is getting on in years"
dazed from or as if from repeated blows
"knocked silly by the impact"
Similar words
goofy
wacky
whacky
zany
airheaded
dizzy
empty-headed
featherbrained
giddy
light-headed
Source: Open English WordNet (CC BY 4.0).