This is a silly sounding word, isn’t it? I found in The Greatest Adventures of Sherlock Holmes, “The Hound of the Baskervilles”. Since it is part of a description, my first thought was that it was like the pug dog, wrinkled, but I was not correct.

Pugnacious – eager or quick to argue, quarrel, or fight

Usage: Dr Watson described Henry Baskerville as “a small, alert, dark-eyed man about thirty years of age, very sturdily built, with thick black eyebrows and a strong, pugnacious face.”