Etymology
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ingrate (n.)

"ungrateful person," 1670s, from earlier adjective meaning "unfriendly," also "ungrateful, unthankful" (14c.), from Latin ingratus "unpleasant, disagreeable," also "ungrateful, unthankful," and "thankless, unprofitable," from in- "not" (see in- (1)) + gratus "pleasing, beloved, dear, agreeable" (from suffixed form of PIE root *gwere- (2) "to favor").

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Definitions of ingrate

ingrate (n.)
a person who shows no gratitude;
Synonyms: thankless wretch / ungrateful person
From wordnet.princeton.edu