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English definition of “thankless”

thankless

adjective uk   /ˈθæŋk.ləs/ us  
describes a piece of work that is difficult or unpleasant, and for which people do not thank you: Keeping the children's rooms tidy is a thankless task/job.Serious and unpleasantNot attractive to look atInformal words for bad
(Definition of thankless from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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