--> Irreversibly has double "rr" is mispronounced as "r"
Remember double 'RR' in between the strings i & eversibly which should not be misspelled with single 'R'
Wrong Spelling:  i-r-eversibly 
Correct Spelling:  i-rr-eversibly 
Find more wrongly spelled words of Irreversibly to spell it well.