expression, i-adjective
Idiomatic expression meaning to speak one's mind without mincing words; often used to describe a person who is blunt or straightforward.
See also: 歯に衣着せぬ
He is famous for his outspoken way of speaking.
歯に衣着せずに言うと、その計画は失敗すると思う。
To be frank, I think that plan will fail.