Part of speech: Adjective
not feeling or showing gratitude
Example: ungrateful heirs; How sharper than a serpent's tooth it is / To have a thankless child!"- Shakespeare
Part of speech: Adjective
disagreeable
Example: I will not perform the ungrateful task of comparing cases of failure"- Abraham Lincoln
Unthankful, Thankless, Ungrateful
un – A related word in the same word family.
grateful – A related word in the same word family.
Related words show how one ancient root could spawn dozens of modern meanings.