Succusive or Succussive: How To spell?
The word Succusive is misspelled against Succussive, an adjective meaning "Characterized by a shaking motion, especially an up and down movement, and not merely tremulous oscillation; as, the succussive motion in earthquakes."
Succussive has double "ss" is mispronounced as "s"Remember double 'SS' in between the strings succu & ive which should not be misspelled with single 'S'
Wrong Spelling:  succu-s-ive  Correct Spelling:  succu-ss-ive 
Check more misspelled words of Succussive to spell it correct.