Meaning of “silly” in the English Dictionary

"silly" in British English

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sillyadjective

uk /ˈsɪl.i/ 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 served our drinks in these silly little glasses.

More examples

  • What's the name of that guy on TV - you know, the American one with the silly voice?
  • They can't expect me to accommodate all their silly little likes and dislikes.
  • Why are you putting on that silly voice?
  • I screamed myself silly on the roller coaster.
  • Seriously now, did he really say that or are you just being silly?

(Definition of “silly” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"silly" in American English

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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)