Adjective
- 1. ungrateful (vs. grateful), thankless, unthankful, unappreciative
- usage: not feeling or showing gratitude; "ungrateful heirs"; "How sharper than a serpent's tooth it is / To have a thankless child!"- Shakespeare
- 2. thankless, unappreciated, ungratifying, unrewarding (vs. rewarding)
- usage: not likely to be rewarded; "grading papers is a thankless task"
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All rights reserved.Definition and meaning of thankless (Dictionary)