Pronunciation: (lôst, lost),[key] —adj. 1. no longer possessed or retained: lost friends. 2. no longer to be found: lost articles. 3. having gone astray or missed the way; bewildered as to place, direction, etc.: lost children. 4. not used to good purpose, as opportunities, time, or labor; wasted: a lost advantage. 5. being something that someone has failed to win: a lost prize. 6. ending in or attended with defeat: a lost battle. 7. destroyed or ruined: lost ships. 8. preoccupied; rapt: He seems lost in thought. 9. distracted; distraught; desperate; hopeless: the lost look of a man trapped and afraid. 10. get lost,Slang. a. to absent oneself: I think I'll get lost before an argument starts. b. to stop being a nuisance: If they call again, tell them to get lost. 11. lost to, a. no longer belonging to.
b. no longer possible or open to: The opportunity was lost to him. c. insensible to: lost to all sense of duty.