Definition
To act truculently means to do something in a way that is aggressively defiant, bad-tempered, and likely to argue or fight. It suggests a combative and hostile attitude. Imagine someone challenging every statement you make, just for the sake of arguing; that's truculent. It is similar to being belligerent or pugnacious. It's different from being agreeable or cooperative; it suggests a constant readiness for conflict. It is the opposite of behaving peacefully.