Thickskul or Thickskull: How To spell?
The word Thickskul is misspelled against Thickskull, a noun meaning "A dullard, or dull person; a blockhead; a numskull."
Thickskull has double 'll' in the end mispronounced as 'l'Remember double 'LL' appears in the end of this word which should not be misspelled with single 'L'
Wrong Spelling:  thicksku-l  Correct Spelling:  thicksku-ll 
Check more misspelled words of Thickskull to spell it correct.