'demonic' originates from Greek, specifically the word 'daimonikos,' where 'daimon' meant 'spirit' or 'demon.'

'daimonikos' transformed into the Latin word 'daemonicus,' and eventually became the modern English word 'demonic' through Middle English.

Initially, it meant 'pertaining to a spirit or demon,' but over time it evolved into its current meaning of 'resembling or characteristic of a demon or evil spirit.'