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1. slang Not hip, trendy, sophisticated, or fashionable. You may think your parents are uncool, but remember that you're doomed to be considered uncool by your own kids some day. I felt really self-conscious driving such an uncool car to my new job.
2. slang Lacking some degree of suave aloofness, self-confidence, or social skills. Why do you always have to get so uncool around Becky? You're making me look uncool by association! I always feel really uncool at these parties my roommates throw. Everyone else is so chill and laid-back, while I just feel anxious and annoying.
3. slang Socially unacceptable or inappropriate. That was really uncool what you did to Stephanie, Janet! A: "So then I pulled the chair out from under him just as he was about to sit down!" B: "Uncool, dude. You could have really hurt him!
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
mod. square; dull and orthodox. This place is uncool. Let’s cruise.
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.