unthankful
1 antonym for unthankful — opposites grouped by meaning.
Adj — Showing no gratitude for what has been done for you.
Antonyms
Etymology
Came into English via Middle English unthankful, which developed from Old English unþancful, unþancfull, unġeþancfull (“unthankful, ungrateful”), made up of un- and thankful. Cognate with Old High German undankfol (“unthankful, ungrateful”).
Full origin of unthankful →