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