niggling
动词 niggle:
worry unnecessarily or excessively
同义词:fuss, niggle, fret
argue over petty things
同义词:quibble, niggle, pettifog, bicker, squabble, brabble
形容词 niggling:
(informal) small and of little importance
同义词:fiddling, footling, lilliputian, little, piddling, piffling, petty, picayune, trivial