silly Definition in the Cambridge English Dictionary
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Definition of “silly” - English Dictionary

Definition of "silly" - American English Dictionary

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sillyadjective

 us   /ˈsɪl·i/
showing a ​lack of ​thought or ​judgment; not ​serious and not ​showing much ​intelligence: a silly ​grin I ​watched another silly ​movie last ​night.
silliness
noun [U]  us   /ˈsɪl·i·nəs/
It’s ​time to ​stop the silliness and get ​serious.
(Definition of silly from the Cambridge Academic Content Dictionary © Cambridge University Press)

Definition of "silly" - British English Dictionary

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sillyadjective

uk   us   /ˈsɪl.i/
B1 showing little ​thought or ​judgment: Don't do that, you silly ​boy! a silly ​mistake It was silly of you to go out in the ​sun without a ​hat. embarrassed; ​afraid that ​people will ​laugh at you: I ​feel silly in this ​dress.
Synonym
B1 not ​important, ​serious, or ​practical: She gets ​upset over such silly things. We were ​servedourdrinks in these silly little ​glasses.
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(Definition of silly from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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