“Truculent” is a versatile adjective that can apply to many types of negative contexts. A teenager might be described as truculent if they act belligerent after being told they can’t attend a party, but the word might also apply to brutally harsh criticism. It comes from the Latin “trux,” meaning “savage,” which corresponds to other usages. For example, a wild animal might be described as truculent when it displays fierce protective behaviors. The adjective also applies to contexts of deadly and destructive force.