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.
Not obtaining or deserving thanks; unacceptable; as, a thankless task. To shepherd thankless, but by thieves that love the night allowed. Chapman. -- Thank"less*ly, adv. -- Thank"less*ness, n.
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