Ireversibleness or Irreversibleness: How To spell?
The word Ireversibleness is misspelled against Irreversibleness, a noun meaning "The state or quality of being irreversible."
Irreversibleness has double "rr" is mispronounced as "r"Remember double 'RR' in between the strings i & eversibleness which should not be misspelled with single 'R'
Wrong Spelling:  i-r-eversibleness  Correct Spelling:  i-rr-eversibleness 
Find more wrongly spelled words of Irreversibleness to spell it well.