Defeul or Defail: How To spell?

The word Defeul is misspelled against Defail, a verb meaning "To cause to fail."

Word contains consecutive vowels 'AI' in between alphabets def & l is misspelled as 'EU'
Wrong Spelling:  def-eu-l 
Correct Spelling:  def-ai-l 
Check more misspelled words of Defail to spell it correct.

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