(of a person's voice) low and unfriendly, or (of a person's behaviour) unfriendly or showing no patience(声音)低沉而生硬的,粗声粗气的;(行为)不友好的,不耐烦的,粗暴的
"Yeah, so what?" came the gruff reply.“是的,那又怎样?”对方生硬地回答道。
He's quite a sweet man beneath the gruff exterior.他外表冷漠内心善良。