adjective
a word that describes or modifies a noun or pronoun, in this case, 'thankless' describes something that is not deserving of thanks
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Working as a customer service representative can be a thankless job at times.
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Being a referee for kids' soccer games is a pretty thankless task.
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Cleaning up after the party was a totally thankless gig.
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Being the middle child often feels like a thankless position in the family.