Unthred or Unthread: How To spell?

The word Unthred is misspelled against Unthread, a verb meaning "To deprive of ligaments; to loose the ligaments of."

Unthread has vowels 'ea' together mispronounced as 'e'
Word contains consecutive vowels 'EA' in between alphabets unthr & d is misspelled as 'E'
Wrong Spelling:  unthr-e-d 
Correct Spelling:  unthr-ea-d 
Explore spell check of Unthread to spell without errors.

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