Unfaylable or Unfailable: How To spell?

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

Word contains consecutive vowels 'AI' in between alphabets unf & lable is misspelled as 'AY'
Wrong Spelling:  unf-ay-lable 
Correct Spelling:  unf-ai-lable 
Explore spell check of Unfailable to spell without errors.

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