Ofteness or Oftenness: How To spell?

The word Ofteness is misspelled against Oftenness, a noun meaning "Frequency."

Oftenness has double "nn" is mispronounced as "n"
Remember double 'NN' in between the strings ofte & ess which should not be misspelled with single 'N'
Wrong Spelling:  ofte-n-ess 
Correct Spelling:  ofte-nn-ess 
Explore spell check of Oftenness to spell without errors.

You might be interested to know

Penyroyal or Pennyroyal?

Plainess or Plainness?

Scaned or Scanned?