- not having or showing composure or self-control; not cool
- unacceptable, unfashionable, unpleasant, etc., esp. by the standards of a given group
- Lacking assurance, self-control, or sophistication.
- Not in accord with the standards or mores of a specified group: “trying to teach children simply to reject drugs as uncool” (Larry Martz).
(comparative more uncool, superlative most uncool)