Plenness or Plainness: How To spell?
The word Plenness is misspelled against Plainness, a noun meaning "The quality or state of being plain."
Word contains consecutive vowels 'AI' in between alphabets pl & nness is misspelled as 'E'Wrong Spelling:  pl-e-nness  Correct Spelling:  pl-ai-nness 
Explore spell check of Plainness to spell without errors.