Etymology
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pugnacious (adj.)

"disposed to fight, quarrelsome," 1640s, a back-formation from pugnacity or else from Latin pugnacis, genitive of pugnax "combative, fond of fighting," from pugnare "to fight," especially with the fists, "contend against," from pugnus "a fist" (from PIE *pung-, nasalized form of root *peuk- "to prick"). Related: Pugnaciously; pugnaciousness.

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Definitions of pugnacious

pugnacious (adj.)
tough and callous by virtue of experience;
pugnacious (adj.)
ready and able to resort to force or violence; "pugnacious spirits...lamented that there was so little prospect of an exhilarating disturbance"- Herman Melville;
Synonyms: rough
From wordnet.princeton.edu