incorrigibleunable to be corrected, improved, or reformed; incurableThe incorrigible optimist refused to see any situation as hopeless, no matter how dire.NoteThe incorrigible optimist refused to see any situation as hopeless, no matter how dire.Elon.io is an online learning platformWe have an entire course teaching GRE Verbal — Essential Vocabulary grammar and vocabulary.Start learning GRE Verbal — Essential Vocabulary now