niggling
[ˈnɪɡlɪŋ]
adj.
不断烦扰的;
（一件工作）费神的;
难办的;
繁琐的;
v.
为小事操心，吹毛求疵( niggle的现在分词 );
不断地烦扰;
例句:
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There is this niggling little thing called evidence that has heretofore been absent.
来自SA
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She had niggling doubts about their relationship.
她时常对他们的关系有一丝疑虑。
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The matter is too small to be worth niggling over.
小小不言的事,不必计较.
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It's been niggling at my mind ever since I met Neville in Nice.
自从在尼斯见到内维尔后，我一直忐忑不安。
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She had a certain impatience, especially for niggling scholars.
来自Antiquaries Journal
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The Act of Settlement had imposed many niggling...restrictions on the power of a sovereign.
来自C. C. Trench