The Collaborative International Dictionary of English v.0.48:

Subversive \Sub*ver"sive\, a. [Cf. F. subversif.]
   Tending to subvert; having a tendency to overthrow and ruin.
   [1913 Webster]

         Lying is a vice subversive of the very ends and design
         of conversation.                         --Rogers.
   [1913 Webster]

WordNet (r) 3.0 (2006):

subversive
    adj 1: in opposition to a civil authority or government [syn:
           insurgent, seditious, subversive]
    n 1: a radical supporter of political or social revolution [syn:
         revolutionist, revolutionary, subversive,
         subverter]

Moby Thesaurus II by Grady Ward, 1.0:

165 Moby Thesaurus words for "subversive":
   Bolshevik, Bolshevist, Bolshie, Carbonarist, Carbonaro, Castroist,
   Castroite, Charley, Communist, Cong, Fenian, Guevarist, Jacobin,
   Leninist, Maoist, Marxist, Mau-Mau, Puritan, Red, Red Republican,
   Roundhead, Sinn Feiner, Trojan horse, Trotskyist, Trotskyite, VC,
   Vietcong, Wobbly, Yankee, Yankee Doodle, agitator, altered, anarch,
   anarchist, anarchistic, anarcho-syndicalist, baneful, better,
   bonnet rouge, brawler, breakaway, calamitous, cataclysmal,
   cataclysmic, catastrophic, changeable, changed, collaborationist,
   collaborator, consuming, consumptive, converted,
   criminal syndicalist, crypto, deadly, defector, degenerate,
   demolishing, demolitionary, depredatory, desolating, destroying,
   destructive, devastating, deviant, disastrous, dissident,
   divergent, doomful, extreme, extreme left-winger, extremist,
   extremistic, factious, fatal, fateful, fellow traveler,
   fifth column, fifth columnist, fraternizer, fratricidal, frondeur,
   improved, insubordinate, insurgent, insurrectionary,
   insurrectionist, insurrecto, internecine, left-wing extremist,
   lunatic fringe, malcontent, maverick, metamorphosed, metastasized,
   mild radical, mildly radical, modified, mutant, mutineer,
   mutineering, mutinous, nihilist, nihilistic, nonconformist,
   parlor Bolshevik, parlor pink, pink, pinko, qualified, quisling,
   radical, ravaging, rebel, rebellious, rebuilt, red, reformed,
   renewed, revived, revolter, revolutional, revolutionary,
   revolutionary junta, revolutioner, revolutionist, revolutionizer,
   rioter, riotous, ruining, ruinous, saboteur, sans-culotte,
   sans-culottist, security risk, seditionary, seditious,
   self-destructive, subversionary, suicidal, syndicalist, terrorist,
   traitor, traitorous, transformed, translated, transmuted,
   treacherous, treasonable, treasonous, turbulent, ultra,
   ultraconservative, ultraist, ultraistic, underground, unmitigated,
   vandalic, vandalish, vandalistic, wasteful, wasting, withering,
   worse, yippie