silly

I UK [ˈsɪlɪ] / US adjective
Word forms "silly":
adjective silly comparative sillier superlative silliest
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1)

a) showing that you are not intelligent, not serious, not thinking carefully etc

a silly mistake

It sounds a bit silly to me.

b) used for saying you think something or someone is not sensible or does not deserve any respect

You silly boy, you put your shirt on backwards.

I look pretty silly in this dress.

2) not serious, important, or practical

Don't get upset over silly things that people say.

They made us sit on these silly little chairs.

3) unsuitable and annoying, especially because it makes you seem stupid or like a child

a silly game

a silly hat

Stop acting silly!

4) in a state when you are not able to do anything sensible

Morris laughed himself silly.

She was scared silly.

Derived word:
silliness
noun uncountable
II UK [ˈsɪlɪ] / US noun [countable]
Word forms "silly":
singular silly plural sillies

used for telling someone, especially a child, that you think their behaviour is stupid or annoying

Listen, silly, we've got to leave now.