gnawing
[ˈnɔ:ɪŋ]
adj.
痛苦的，苦恼的;
v.
咬( gnaw的现在分词 );
（长时间） 折磨某人;
（使）苦恼;
（长时间）危害某事物;
例句:
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Mary Ann's exhilaration gave way to gnawing fear.
玛丽·安从欣喜若狂变得忧惧不安。
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The dog was gnawing a bone.
那狗在啃骨头。
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These doubts had been gnawing at him for some time.
这些疑虑已经折磨他一段时间了.
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Dribbling and gnawing is also a common complaint.
来自BBC
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Enrichment and arm-gnawing look roughly the same when viewed from the start.
来自WSJ
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I would sit in the morning, gnawing on my sugary breakfast cereal, just thinking.
来自SA