hex(noun, adjective, verb) adjective1. of or pertaining to a number system having 16 as its baseSimilar word(s): hexadecimal noun1. an evil spellSimilar word(s): curse, jinx, whammyDefinition categories: communication, charm, spell verb1. cast a spell over someone or something; put a hex on someone or somethingSimilar word(s): bewitch, enchant, glamour, jinx, witchDefinition categories: communication, becharm, charm