ingrate
Concise Oxford English Dictionary © 2008 Oxford University Press:
ingrate /ˈɪngreɪt, ɪnˈgreɪt/ formal or literary
▶noun an ungrateful person. ▶adjective ungrateful.
– origin ME: from L. ingratus, from in- ‘not’ + gratus ‘grateful’.
'ingrate' also found in these Oxford entries:

