Stifly or Stiffly: How To spell?
The word Stifly is misspelled against Stiffly, an adverb meaning "In a stiff manner."
Stiffly has double "ff" is mispronounced as "f"Remember double 'FF' in between the strings Sti & ly which should not be misspelled with single 'F'
Wrong Spelling:  Sti-f-ly  Correct Spelling:  Sti-ff-ly 
Find more wrongly spelled words of Stiffly to spell it well.