ruthlessa GRE synonym for 'harsh' meaning relentlessly severe or cruel and unwilling to show mercyThe ruthless competitor undercut prices until every rival was driven out of business.NoteThe ruthless competitor undercut prices until every rival was driven out of business.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