sil‧ly1 S3 comparative sillier, superlative silliest
not sensible, or showing bad judgment:
Stop asking silly questions.
You made a lot of silly mistakes.
I left my keys at home, which was a pretty silly thing to do.
'Shall we go for a walk?' ' Don't be silly, it's dark.'
stupid in a childish or embarrassing way:
I feel so silly in this outfit.
a silly hat
I hate their parties - we always end up playing silly games.
not serious or practical:
They served us coffee in these silly little cups.
to make someone extremely bored
to drink or laugh etc so much that you stop behaving sensibly
—silliness noun [uncountable]