1. Prophetic of devastation or ultimate doom
   "The apocalyptic predictions in the book described a world ravaged by climate change";
   - apocalyptical, revelatory
    
2. Of or relating to an apocalypse
   "The apocalyptic imagery in the film depicted a world devastated by nuclear war"
    
3. Wreaking or capable of wreaking complete destruction
   "possessing apocalyptic power";
   - annihilative, annihilating, devastating

See also: destructive, prophetic, prophetical

Encyclopedia: Apocalyptic