1. 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.
2. 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.
adj 1: not feeling or showing gratitude; "ungrateful heirs"; "How
sharper than a serpent's tooth it is / To have a
thankless child!"- Shakespeare [syn: ungrateful, unthankful]
2: not likely to be rewarded; "grading papers is a thankless
task" [syn: unappreciated, ungratifying]