Indiferency or Indifferency: How To spell?
The word Indiferency is misspelled against Indifferency, a noun meaning "Absence of interest in, or influence from, anything; unconcernedness; equilibrium; indifferentism; indifference."
Indifferency has double "ff" is mispronounced as "f"Remember double 'FF' in between the strings Indi & erency which should not be misspelled with single 'F'
Wrong Spelling:  Indi-f-erency  Correct Spelling:  Indi-ff-erency 
Find more wrongly spelled words of Indifferency to spell it well.