John Proctor is direct and blunt, though also, at times artful in his use of metaphor.
Proctor's blunt way of speaking is on display in the opening act of the play as he directly criticizes the idea of bringing Hale to Salem and also Parris' attitude as the leader of the church.
Later, when Proctor has made up his mind not to sign the false confession and is on his way to the gallows, he uses metaphors to frame his point. He tells Elizabeth not to cry and to make her heart stony, and with it "sink them", meaning sink those who were driving him to the gallows.
For the most part, however, Proctor's speech is direct and unadorned.