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

Love words?

You must — there are over 200,000 words in our free online dictionary, but you are looking for one that’s only in the Merriam-Webster Unabridged Dictionary.

Start your free trial today and get unlimited access to America's largest dictionary, with:

• More than 250,000 words that aren't in our free dictionary
• Expanded definitions, etymologies, and usage notes
• Advanced search features
• Ad free!