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It means to criticize in a petty way or to work ineffectively
No idea niggles please help me.
Niggles Bambino, Frock Ganasty, Chiggles Von Gostywarp, and Backne Von Jacknizz
Someone who constantly nags is a nagger. Someone who constantly niggles is a niggler. Nagger, niggler, it's all the same.
Some people just lose that spark. The excitement wears off, and they see the faults and niggles that they didn't notice before.