Relating to or characterized by the absence of consciousness or mental activity; not involving the mind or soul.
From Greek a- (without) + psyche (mind/soul) + -ical (suffix forming adjectives). This is the adjectival form of apsychia, used in philosophical and medical contexts to describe non-mental or unconscious states.
Philosophers used apsychical to describe things like reflexes—actions your body does without your brain even asking permission!
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