Roget's Thesaurus: Entry 917 (Ingratitude)

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#917. Ingratitude. -- N. ingratitude, thanklessness, oblivion of benefits, unthankfulness[obs].

" benefits forgot "; thankless task,thankless office.

V. be ungrateful &c. adj.; forget benefits; look a gift horse in the mouth.

Adj. ungrateful, unmindful, unthankful; thankless, ingrate, wanting in gratitude, insensible of benefits.

forgotten; unacknowledged, unthanked[obs], unrequited, unrewarded; ill-requited.

Int. thank you for nothing! thanks for nothing! " et tu Brute! " [Julius Caesar].

Phr. "ingratitude! thou marble-hearted fiend " [Lear].