Subversive

/səbˈvɜr.sɪv/ adjective medium

Seeking to undermine or overthrow an established system, government, or set of ideas.

The pamphlet was considered subversive because it openly questioned the ruling party's authority.

Memory Trick

Sub- (under) plus vert (turn) — subversive literally means 'turning things under,' flipping the established order from below.