cataclysmic (adj.)
- baneful
- black
- calamitous
- cataclysmal
- catastrophic
- consuming
- consumptive
- convulsive
- deadly
- destroying
- destructive
- devastating
- dire
- disastrous
- fatal
- fateful
- grievous
- insurrectionary
- internecine
- jerky
- nihilistic
- paroxysmal
- radical
- ravaging
- revolutionary
- ruinous
- seismic
- self-destructive
- spasmodic
- spastic
- subversive
- suicidal
- sweeping
- tragic
- wasteful
- withering
