1. most rough or harsh in manner or voice; most unfriendly or bad-tempered (superlative form of gruff)
Usage: superlative form

Examples

• He was the gruffest teacher in the school, but students respected him.
• The gruffest voice came from the back of the room.
• Even at his gruffest, the old man had a kind heart.
• She spoke in her gruffest tone to hide her emotions.
• The gruffest sailor on the ship was actually quite helpful.
• His gruffest manner couldn’t disguise his concern for others.