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“ungrateful” in Latin

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

ungrateful
ingratus (not mindful of a benefit received, but also in the sense of not paying or rewarding anybody’s pains): beneficii, beneficiorum immemor (unmindful of a past favor, unthankful as to character or sentiment): ingratus in referenda gratia (unthankful, not displaying gratitude).

Quick answer

What is the Latin word for ungrateful?
The usual Latin words for “ungrateful” are ingrātus, beneficium. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.