adj. 1 subversionary, seditious, seditionary, treasonous, treacherous, traitorous, revolutionary, insurrectionary The government regarded as subversive anything and anyone disagreeing with their policies
n. 2 traitor, insurgent, saboteur, fifth-columnist, collaborator, collaborationist, quisling, radical, revolutionary, insurrectionist, insurrectionary; dissident, defector The security agencies were removing subversives from sensitive jobs