ungrateful

1 not likely to be appreciated by those who benefit the park's custodial staff has the ungrateful job of cleaning up after the Independence Day party is over Synonyms unappreciated, thanklessRelated Words uncredited, underappreciated, underrated, undervalued, unnoticed, unrecognized, unrewarded, unsung, unvaluedNear Antonyms credited, esteemed, honored, prized, recognized, regarded, rewarded, valued; creditable, meritorious, praiseworthyAntonyms appreciated

2 not showing gratitude although the food was being provided for free, the ungrateful recipients could not refrain from complaining that it was not to their liking Synonyms unappreciative, thanklessRelated Words rude, thoughtless, ungraciousNear Antonyms beholden, indebted; gratified, pleased; courteous, gracious, thoughtfulAntonyms appreciative, grateful, obliged, thankful