thank·less

[thangk-lis]
adjective
1.
not likely to be appreciated or rewarded; unappreciated: a thankless job.
2.
not feeling or expressing gratitude or appreciation; ungrateful: a thankless child.

Origin:
1530–40; thank + -less

thank·less·ly, adverb
thank·less·ness, noun


1. unacknowledged, vain, unrewarding, profitless.
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Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
thankless (ˈθæŋklɪs) [Click for IPA pronunciation guide]
 
adj
1.  receiving no thanks or appreciation: a thankless job
2.  ungrateful: a thankless pupil
 
'thanklessly
 
adv
 
'thanklessness
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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00:10
Thankless is always a great word to know.
So is ort. Does it mean:
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
a scrap or morsel of food left at a meal.
Etymonline
Word Origin & History

thankless
"likely to not be rewarded with thanks," 1540s, from thank + -less. Related: Thanklessly.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Cutting it is a thankless and unpopular task, but unavoidable if our country
  and party are to be taken seriously.
And follow these tips to make sure a tankless decision doesn't end up thankless.
If you do complete a task and report on it, people remember that you did it,
  and they'll appoint you to more thankless work.
He welcomed the thankless task and carried it out with devotion.
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