Which word describes someone who is inclined to quarrel or fight readily?

The word that best describes someone who is inclined to quarrel or fight readily is "pugnacious." This term specifically refers to an inclination to engage in physical confrontations or disputes. It captures the essence of being combative in a way that emphasizes a readiness to fight, often suggesting that this behavior is part of the individual's character.

While "aggressive," "combative," and "feisty" also imply a readiness to confront challenges or engage in conflict, they carry slightly different connotations. "Aggressive" often implies a forceful approach but does not exclusively denote a propensity to fight. "Combative" suggests a readiness to argue or fight but can apply more broadly to any situation involving conflict. "Feisty" conveys spiritedness and liveliness, which may include a tendency to quarrel, but it often has a more playful or positive connotation, rather than focusing strictly on the inclination to fight. Thus, "pugnacious" is the most precise term for someone who readily engages in quarrels or fights.