- 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.
Meaning of 'ungrateful' (Princeton's WordNet)
1 . ungrateful
[ a]
Meaning (1): - not feeling or showing gratitude
Example in sentence:
How sharper than a serpent's tooth it is / To have a thankless child!;
ungrateful heirs
2 . ungrateful
[ s]
Meaning (2): - disagreeable
Example in sentence:
I will not perform the ungrateful task of comparing cases of failure