Unfeilable or Unfailable: How To spell?

The word Unfeilable is misspelled against Unfailable, an adjective meaning "Infallible."

Word contains consecutive vowels 'AI' in between alphabets unf & lable is misspelled as 'EI'
Wrong Spelling: unf-ei-lable
Correct Spelling: unf-ai-lable
Find more wrongly spelled words of Unfailable to spell it well.