thankless

[ thangk-lis ]
/ ˈθæŋk lɪs /

adjective

not likely to be appreciated or rewarded; unappreciated: a thankless job.
not feeling or expressing gratitude or appreciation; ungrateful: a thankless child.

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Origin of thankless

First recorded in 1530–40; thank + -less

OTHER WORDS FROM thankless

thank·less·ly, adverbthank·less·ness, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Example sentences from the Web for thankless

British Dictionary definitions for thankless

thankless
/ (ˈθæŋklɪs) /

adjective

receiving no thanks or appreciationa thankless job
ungratefula thankless pupil

Derived forms of thankless

thanklessly, adverbthanklessness, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012