OE

barbaric, primitive Boxers are described as having to “punch each other in the face,” which isn’t “civilized.” In order to do this, they would need to access a part of themselves that was not so civilized (which would work well enough as a fill-in here). Seething and irate are an incorrect pair, both meaning “angry.” Insidious (seductive but harmful; treacherous, deceitful) and dynamic (characterized by constant change) have no relationship.

Primitive doesn't necessarily mean barbaric. It is more inclined to how human live their life in archaic time. Saying primitive is barbaric is like saying ascetic is boring.