01 a. Not acknowledging favors; not expressing thankfulness; unthankful; ungrateful.
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Not acknowledging favors; not expressing thankfulness; unthankful; ungrateful.“That she may feel How sharper than a serpent's tooth it is To have a thankless child!” — Shak.
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Not obtaining or deserving thanks; unacceptable; as, a thankless task.“To shepherd thankless, but by thieves that love the night allowed.” — Chapman.