Indefaisible or Indefeisible: How To spell?

The word Indefaisible is misspelled against Indefeisible, an adjective meaning "Indefeasible."

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