Stifened or Stiffened: How To spell?

The word Stifened is misspelled against Stiffened, which is past tense of "Stiffen"

Stiffened has double "ff" is mispronounced as "f"
Remember double 'FF' in between the strings Sti & ened which should not be misspelled with single 'F'
Wrong Spelling:  Sti-f-ened 
Correct Spelling:  Sti-ff-ened 
Find more wrongly spelled words of Stiffened to spell it well.

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