Unceysable or Unceasable: How To spell?

The word Unceysable is misspelled against Unceasable, an adjective meaning "Not capable of being ended; unceasing."

Unceasable has vowels 'ea' together mispronounced as 'ey'
Word contains consecutive vowels 'EA' in between alphabets unc & sable is misspelled as 'EY'
Wrong Spelling:  unc-ey-sable 
Correct Spelling:  unc-ea-sable 
Explore spell check of Unceasable to spell without errors.

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