demonical

adjective

1. inspired as if by a demon, indwelling spirit, or genius.
2. demoniac(def 1).

adjective

1. of, relating to, or characteristic of a demon; fiendish
2. inspired or possessed by a demon, or seemingly sodemonic laughter

adj.

1660s, from Latin daemonicus, from daemon (see demon). Demonical is from late 15c.