Truculence is the noun for being truculent: a mood or manner that is aggressive, sulky and looking for a fight. Picture someone who answers every reasonable question with a challenge, arms folded, chin out, tone hard. That whole quality is their truculence. It is a formal, written word — you will find it in journalism, history writing and character description far more than in conversation. Two flavours are worth separating. Used of a country or a leader, truculence means a bluntly hostile, threatening way of behaving toward others: "the growing truculence of the regime's statements". Used of a person in daily life, it is smaller and more like defiant bad temper — a teenager, an unhappy employee, a customer who has decided to be difficult. It is uncountable, so no *a truculence* and no plural. And it is not a neutral description; calling someone's behaviour truculence is a criticism, and a fairly cutting one because the word itself sounds educated and cool while the behaviour it names is not.

（態度上的）好鬥、蠻橫、挑釁；動不動就想吵架的脾氣