Unintermision or Unintermission: How To spell?
The word Unintermision is misspelled against Unintermission, a noun meaning "Want or failure of intermission."
Unintermission has double "ss" is mispronounced as "s"Remember double 'SS' in between the strings unintermi & ion which should not be misspelled with single 'S'
Wrong Spelling:  unintermi-s-ion  Correct Spelling:  unintermi-ss-ion 
Find more incorrect spellings of Unintermission to spell right way.