na-adjective, noun
rough speaking; harsh language
Describes a person's manner of speaking as rough, blunt, or harsh. Often used with な to modify nouns or with だ/です in predicates.
彼は口荒な言い方をするが、本当は優しい。
He has a rough way of speaking, but he is actually kind.
口荒な態度は誤解を招く。
A rough manner of speaking can cause misunderstandings.
Compound of 口 (mouth, speech) and 荒 (rough, wild). The exact historical derivation is uncertain, but the word is formed from native Japanese elements.