/ Dictionary / Index T thankless: Meaning and Definition of Find definitions for: thank•less Pronunciation: (thangk'lis), [key] — adj. not likely to be appreciated or rewarded; unappreciated: a thankless job. not feeling or expressing gratitude or appreciation; ungrateful: a thankless child. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: thankless (Thesaurus) thankful thanksgiver Related Content Daily Word Quiz: frugal Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language