The Collaborative International Dictionary of English v.0.48:

Subversionary \Sub*ver"sion*a*ry\, a.
   Promoting destruction.
   [1913 Webster]

Moby Thesaurus II by Grady Ward, 1.0:

35 Moby Thesaurus words for "subversionary":
   baneful, calamitous, cataclysmal, cataclysmic, catastrophic,
   consuming, consumptive, deadly, demolishing, demolitionary,
   depredatory, desolating, destroying, destructive, devastating,
   disastrous, doomful, fatal, fateful, fratricidal, internecine,
   nihilist, nihilistic, ravaging, ruining, ruinous, self-destructive,
   subversive, suicidal, vandalic, vandalish, vandalistic, wasteful,
   wasting, withering