1. Not grateful; not thankful for favors; making no returns, or making ill return for kindness, attention, etc.; ingrateful.
2. Unpleasing; unacceptable; disagreeable; as, harsh sounds are ungrateful to the ear.
-- Un*grate*ful*ly, adv. -- Un*grate*ful*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: thankless, unthankful]
2: disagreeable; "I will not perform the ungrateful task of
comparing cases of failure"- Abraham Lincoln