Similar words: less than, thankfulness, no less than, ankle, anklet, rankle, thank, thanks. Meaning: ['θæŋklɪs] 
adj. 1. not feeling or showing gratitude 2. not likely to be rewarded.
adj. 1. not feeling or showing gratitude 2. not likely to be rewarded. 
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31. She might feel how sharper than a serpent's tooth it was to have a thankless child.
32. BEING a Middle East peace envoy is a thankless task.
33. Why do this thankless task may also be a matter of and ruin, not desirable.
34. My study habits have gone down the tubes. I started out working in a disciplined way at our quiet, well-lighted kitchen table. But I'm becoming frustrated with this thankless process.
35. You don't have to trudge to work every day slaving away for a thankless boss.
36. It was also thankless.
37. I shall be only too grateful to them for taking a very difficult and thankless job off my hands.
38. What I believed would be a spectacular work experience swiftly revealed itself to be a series of thankless performances in such splashy venues as cafeterias and dormitory lobbies.
More similar words: less than, thankfulness, no less than, ankle, anklet, rankle, thank, thanks, thank you, thankful, thank God, thanks to, give thanks, thankfully, Thanksgiving, reckless, feckless, recklessly, changeless, tinkle, wrinkle, wrinkled, sprinkle, sprinkler, sprinkled, frankly, hackles, uselessness, than, selflessness.