Nagging; fussy or picky—habitually critical or constantly telling others what to do, often about small details.
母は食事のマナーについて口うるさい。
My mother is picky about table manners.
彼は細かいことに口うるさくて、同僚が困っている。
He's nitpicky about small things and his colleagues are troubled.
学校から子供の服装について口うるさく注意された。
The school nagged us about the children's clothing.