[ uhn-thangk-fuhl ]
See synonyms for unthankful on Thesaurus.com
  1. not thankful; ungrateful.

  2. 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

Other words from unthankful

  • un·thank·ful·ly, adverb
  • un·thank·ful·ness, noun

Words Nearby unthankful

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2024

How to use unthankful in a sentence