nig·gling
adjective/ˈnɪɡlɪŋ/
/ˈnɪɡlɪŋ/
(also less frequent niggly
/ˈnɪɡli/
/ˈnɪɡli/
)- used to describe a slight feeling of worry or pain that does not go away
（不严重却不断）烦人的，疼痛的 - She had niggling doubts about their relationship.
她时常对他们的关系有一丝疑虑。 - a series of niggling injuries
接连不断的小伤痛
- She had niggling doubts about their relationship.
- not important
无足轻重的；微不足道的 - niggling details
琐碎的细节
- niggling details