Difinitive or Diffinitive: How To spell?
The word Difinitive is misspelled against Diffinitive, an adjective meaning "Definitive; determinate; final."
Diffinitive has double "ff" is mispronounced as "f"Remember double 'FF' in between the strings Di & initive which should not be misspelled with single 'F'
Wrong Spelling:  Di-f-initive  Correct Spelling:  Di-ff-initive 
Find more wrongly spelled words of Diffinitive to spell it well.