unthankful
2 synonyms and 1 antonym for unthankful, grouped by meaning and by how common each one is.
Adj — Showing no gratitude for what has been done for you.
Synonyms
Less common
Still standard English, but they carry more weight.
Rare, literary or technical
Precise, but they will stand out — check the sense before using one.
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 →