Definition of uncool
1 : lacking in assurance, sophistication, or self-control
2 : failing to accord with the values or styles (as of dress or behavior) of a particular group : not accepted or admired as cool or proper <driving an uncool car> <an uncool remark>
Examples of uncool in a sentence
Her parents' car is totally uncool.
It's uncool to lie to your friends.
First Known Use of uncool
UNCOOL Defined for English Language Learners
Definition of uncool for English Language Learners
: not popular or fashionable
: not respectable or acceptable
Learn More about uncool
Seen and Heard
What made you want to look up uncool? Please tell us where you read or heard it (including the quote, if possible).