protuberantly

As Mr. Hagan declared himself his lower jaw came more protuberantly forward and his eyes blazed with an increasing truculence.

The Tyranny of Weakness Charles Neville Buck 1904

I saw Levy clench and unclench his great fists, and his canine jaw working protuberantly as he ground his teeth.

Mr. Justice Raffles 1893

A blest little old-world refuge it must have seemed to us, with its protuberantly-paved and peculiarly resonant small court and idle _communs_ beside it, accessible by a high grille where the jangle of the bell and the clatter of response across the stones might have figured a comprehensive echo of all old Paris.

A Small Boy and Others Henry James 1879