benefits, unthankfulness†.
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†, unrequited, unrewarded; ill-
requited.
Int. thank you for nothing!, thanks for nothing!, et tu Brute! [Julius
Caesar].
Phr. ingratitude! thou marble-hearted fiend [Lear].