The word Undefausible is misspelled against Undefeasible, an adjective meaning "Indefeasible."
-->
Undefeasible has vowels 'ea' together mispronounced as 'au'
Word contains consecutive vowels 'EA' in between alphabets undef & sible is misspelled as 'AU'
Wrong Spelling:  undef-au-sible 
Correct Spelling:  undef-ea-sible 
Check more misspelled words of Undefeasible to spell it correct.