Mischieful or Mischiefful: How To spell?
The word Mischieful is misspelled against Mischiefful, an adjective meaning "Mischievous."
Mischiefful has double "ff" is mispronounced as "f"Remember double 'FF' in between the strings Mischie & ul which should not be misspelled with single 'F'
Wrong Spelling:  Mischie-f-ul  Correct Spelling:  Mischie-ff-ul 
Check more misspelled words of Mischiefful to spell it correct.