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

Origin of thankless

First recorded in 1530–40; thank + -less
Related formsthank·less·ly, adverbthank·less·ness, noun

Synonyms for thankless Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for thankless

Contemporary Examples of thankless

Historical Examples of thankless

British Dictionary definitions for thankless



receiving no thanks or appreciationa thankless job
ungratefula thankless pupil
Derived Formsthanklessly, 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

Word Origin and History for thankless

"likely to not be rewarded with thanks," 1540s, from thank + -less. Related: Thanklessly.

Online Etymology Dictionary, © 2010 Douglas Harper