Not grateful; not expressing gratitude.
A person who fails to show gratitude; an ingrate.
ungrateful; not grateful
Not grateful; not thankful for favors; making no returns, or making ill return for kindness, attention, etc.; ingrateful.
Unpleasing; unacceptable; disagreeable; as, harsh sounds are ungrateful to the ear.
Ungrateful; thankless; unappreciative.
Unpleasing to the sense; distasteful; offensive.
not feeling or showing gratitude;
"How sharper than a serpent's tooth it is / To have a thankless child!"
"I will not perform the ungrateful task of comparing cases of failure"