/ Dictionary / Index R relentless: Meaning and Definition of Find definitions for: re•lent•less Pronunciation: (ri-lent'lis), [key] — adj. that does not relent; unyieldingly severe, strict, or harsh; unrelenting: a relentless enemy. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: relentless (Thesaurus) relent relevant Related Content Daily Word Quiz: placid Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language