Definition of: lost

(lôst, lost) adjective
1. Not to be found or recovered; parted with; missing; left, as by accident, in a forgotten place: lost goods or friends.
2. Not won, gained, used, or enjoyed; missed; wasted: lost opportunity.
3. Ruined physically, morally, or spiritually; damned; destroyed.
4. Having wandered from the way; also, abstracted: lost in thought; bewildered; perplexed.
5. No longer known or used: a lost art.
—to be lost upon (or on) To have no effect upon (a person).