[uhn-thangk-fuh l]
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Origin of unthankful

Middle English word dating back to 1350–1400; see origin at un-1, thankful
Related formsun·thank·ful·ly, adverbun·thank·ful·ness, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for unthankful

Historical Examples of unthankful