Unrason or Unreason: How To spell?

The word Unrason is misspelled against Unreason, a noun meaning "Want of reason; unreasonableness; absurdity."

Unreason has vowels 'ea' together mispronounced as 'a'
Word contains consecutive vowels 'EA' in between alphabets unr & son is misspelled as 'A'
Wrong Spelling:  unr-a-son 
Correct Spelling:  unr-ea-son 
Find more incorrect spellings of Unreason to spell right way.

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