Definitions

1. adjective

tending to undermine or destroy an established system, institution, or authority; opposing or challenging the established order

“The novel was seen as subversive by the government, which led to it being banned.”

2. noun

a person or thing that undermines or destroys an established system, institution, or authority; a person who opposes or challenges the established order

“The subversive elements in the city’s underworld were suspected of involvement in the recent unrest.”