Dunderheyd or Dunderhead: How To spell?
The word Dunderheyd is misspelled against Dunderhead, a noun meaning "A dunce; a numskull; a blockhead."
Dunderhead has vowels 'ea' together mispronounced as 'ey'Word contains consecutive vowels 'EA' in between alphabets dunderh & d is misspelled as 'EY'
Wrong Spelling:  dunderh-ey-d  Correct Spelling:  dunderh-ea-d 
Check more misspelled words of Dunderhead to spell it correct.