i-adjective
nagging; faultfinding; carping
Describes a person who constantly complains, criticizes, or nags about small things. Often used for someone who is overly picky or hard to please.
彼は口うるさい上司で、いつも細かいことを注意してくる。
He is a nagging boss who always points out small things.
口うるさい客に何度もやり直しをさせられた。
I was made to redo the work many times by a faultfinding customer.