ingrateful

From ingrate (“unfriendly”) +‎ -ful, from Latin ingrātus (“disagreeable”), from in- (“not”) +‎ grātus (“pleasing”).

ingrateful (comparative more ingrateful, superlative most ingrateful)

1. ungrateful; not grateful
   • 1667, John Milton, Paradise Lost:

     Ingrateful Eve

   • 1671, John Milton, Samson Agonistes:

     […] under change of times, / And condemnation of the ingrateful multitude.

2. unpleasing to the sense; distasteful
   • 1667, John Milton, Paradise Lost:

     Therefore what he gives / (Whose praise be ever sung) to man in part / Spiritual, may of purest Spirits be found / No ingrateful food

• faultering