Undefeisible or Undefeasible: How To spell?

The word Undefeisible is misspelled against Undefeasible, an adjective meaning "Indefeasible."

Undefeasible has vowels 'ea' together mispronounced as 'ei'
Word contains consecutive vowels 'EA' in between alphabets undef & sible is misspelled as 'EI'
Wrong Spelling:  undef-ei-sible 
Correct Spelling:  undef-ea-sible 
Find more wrongly spelled words of Undefeasible to spell it well.

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