The spelling of the phrase "more numskulled" is fairly straightforward, despite the unusual nature of the word "numskulled." The word itself is spelled phonetically as /nʌmˈskʌld/, with an emphasis on the syllable "skull." The addition of the word "more" simply means that there is an increased degree of idiocy or foolishness being communicated. This phrase is often used colloquially to describe someone who is thought to be exceptionally dim-witted.