pugnacity

This is one of those words that sounds as if it ought to come with a dented helmet. Underneath it sits Latin pugnus, “a fist,” so the whole family begins not with abstract hostility but with a very physical idea: a clenched hand. From there Latin built pugnare, “to fight,” and then pugnax, the person who seems to have picked a quarrel before breakfast. English borrowed the finished noun pugnacity around 1600, packing that old Roman fist into a tidy abstract ending, just as it does in audacity, tenacity, and voracity. The same fist-line gives us pugnacious and even the more sinister-sounding repugnant and impugn, which all feel like cousins from the same argumentative household. If you want to remember it, picture not a philosopher debating calmly, but a hand already half-closed in the air: pugnacity is belligerence with knuckles on.