Intermisive or Intermissive: How To spell?
The word Intermisive is misspelled against Intermissive, an adjective meaning "Having temporary cessations; not continual; intermittent."
Intermissive has double "ss" is mispronounced as "s"Remember double 'SS' in between the strings intermi & ive which should not be misspelled with single 'S'
Wrong Spelling:  intermi-s-ive  Correct Spelling:  intermi-ss-ive 
Find more wrongly spelled words of Intermissive to spell it well.