Demonic

google

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mid 17th century: via late Latin from Greek daimonikos, from daimōn (see demon1).

wiktionary

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From Latin daemonicus, from Ancient Greek δαιμονικός(daimonikós, “possessed by a demon, sent by a demon”), from δαίμων(daímōn). Doublet of daimonic.

etymonline

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demonic (adj.)

also daemonic, 1660s, "devilish, of the nature of or pertaining to a demon," from Latin daemonicus, from daemon (see demon). Demonical is from late 15c.