De·mo'nic adjective [ Latin daemonicus , Greek daimoniko`s .] Of or pertaining to a demon or to demons; demoniac. ' Demonic ambushes.' Lowell. Found on http://www.encyclo.co.uk/webster/D/34
diabolicadjective extremely evil or cruel; expressive of cruelty or befitting hell; `something demonic in him--something that could be cruel`; `fires lit up a diabolic scene`; `diabolical sorcerers under the influence of devils`; `a fiendish despot`; `... Found on https://www.encyclo.co.uk/local/20974