curmudgeona bad-tempered and difficult person, especially an older oneBeneath the exterior of a curmudgeon, he was actually quite generous and warm-hearted.NoteBeneath the exterior of a curmudgeon, he was actually quite generous and warm-hearted.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