1. 麻烦的;琐碎的;细小的
A niggling injury or worry is small but bothers you over a long period of time.

1. (informal) small and of little importance

e.g. a fiddling sum of money
a footling gesture
our worries are lilliputian compared with those of countries that are at war
a little (or small) matter
a dispute over niggling details
limited to petty enterprises
piffling efforts
giving a police officer a free meal may be against the law, but it seems to be a picayune infraction

Synonym: fiddlingfootlinglilliputianlittlepiddlingpifflingpettypicayunetrivial