un·done I. \|ən|dən\adjective Etymology: Middle English undon, undoon, from un- (I) + don, doon done — more at done : not done < a task undone > II. adjective Etymology: Middle English undon, undoon, from past participle of undon, undoon to undo — more at undo 1.: destroyed, ruined < a mind undone > 2.: unfastened < his package came undone while passing through the New York post office — Jane Shellhase >