An archaic or rare form meaning lacking feeling, emotion, or interest; emotionally unresponsive.
From 'apatheia' (Greek: freedom from passion) plus the English suffix '-ical' (variant of '-ic'), creating a formal, older style adjective form.
English used to have both 'apathetic' and 'apathetical,' but we eventually dropped the longer version—it's an example of how language naturally streamlines itself over time.
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