pug ‧ na ‧ cious /pʌɡˈneɪʃəs/ BrE AmE adjective formal
[ Date: 1600-1700 ; Language: Latin ; Origin: pugnax , from pugnare 'to fight' ]
very eager to argue or fight with people:
The professor had been pugnacious and irritable.
—pugnaciously adverb
—pugnacity /pʌɡˈnæsəti, pʌɡˈnæsɪti/ noun [uncountable]