noun
the action of persistently complaining or fault-finding
adjective
repeatedly complaining or fault-finding in an annoying way
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She was tired of his constant nagging about her work habits.
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Stop nagging me about cleaning my room, I'll get to it eventually!
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My mom is always on my case, nagging me to do my homework.
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The sound of the dripping faucet was like a nagging reminder of the plumbing issue.