expression, i-adjective
incompetent; incapable; good-for-nothing
Used to describe a person who lacks ability or talent. Often carries a critical or dismissive tone. The phrase is a set expression combining 能 (ability) with the negative ない.
See also: 能がない
彼は能のない社員だ。
He is an incompetent employee.
能のないやつに任せられない。
I can't leave it to a good-for-nothing guy.