From ingrate (“unfriendly”) + -ful, from Latin ingrātus (“disagreeable”), from in- (“not”) + grātus (“pleasing”).
ingrateful (comparative more ingrateful, superlative most ingrateful)
- ungrateful; not grateful
- 1667: Therefore what he gives / (Whose praise be ever sung) to man in part / Spiritual, may of purest Spirits be found / No ingrateful food — John Milton, Paradise Lost
- 1667: Ingrateful Eve — John Milton, Paradise Lost
- 1671: under change of times, And condemnation of the ingrateful multitude. — John Milton,Samson Agonistes