ROGET THESAURUS
unthankful
Ingratitude
N
ingratitude, thanklessness, oblivion of benefits, unthankfulness, benefits forgot, thankless task, thankless office, 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!, ingratitude! thou marble-hearted fiend.