Thänk'less, a.

a. 1. Not demanding, deserving, or gaining thanks; unacceptable. [Rare.] “To shepherds thankless, but by thieves that love the night allowed.” Chapman. 2. Not acknowledging favors, or expressing thankfulness for them; unthankful; ungrateful. That she may feel How sharper than a serpent's tooth it is To have a thank-less child. Shak.