Misafirm or Misaffirm: How To spell?
The word Misafirm is misspelled against Misaffirm, a verb meaning "To affirm incorrectly."
Misaffirm has double "ff" is mispronounced as "f"Remember double 'FF' in between the strings Misa & irm which should not be misspelled with single 'F'
Wrong Spelling:  Misa-f-irm  Correct Spelling:  Misa-ff-irm 
Find more wrongly spelled words of Misaffirm to spell it well.