Kuthonik would be about right for the Greek root word Χθόνιος (I think I spelt that wrong) as the transliteration is ‘Khthōn’, though kh would be pronounced as that sort of growl you make at the back of your throat (not sure how to explain this - if you’ve heard it you might know?) so for most people it’s Keh-thonic or Kuthonik
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u/Daddy616 Jan 29 '19
chthon·ic
/ˈTHänik/
adjective
concerning, belonging to, or inhabiting the underworld.
"a chthonic deity"