unthankful

adjective

un·​thankful

"+

1

: not such as to call for thanks : disagreeable, thankless, unpleasant

an unthankful assignment

2

: not giving thanks : unappreciative

an unthankful child

unthankfully

"+

adverb

unthankfulness noun

Word History

Etymology

Middle English, from un- entry 1 + thankful

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