[ uhn-thangk-fuh l ]
/ ʌnˈθæŋk fəl /


not thankful; ungrateful.
not repaid with thanks; thankless: an unthankful task.

Origin of unthankful

Middle English word dating back to 1350–1400; see origin at un-1, thankful

Related forms

un·thank·ful·ly, adverbun·thank·ful·ness, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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