The word Unfilable is misspelled against Unfailable, an adjective meaning "Infallible."
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Word contains consecutive vowels 'AI' in between alphabets unf & lable is misspelled as 'I'
Wrong Spelling:  unf-i-lable 
Correct Spelling:  unf-ai-lable 
Find more wrongly spelled words of Unfailable to spell it well.