Chaotic; characterized by complete disorder and unpredictability; in a state of chaos.
From 'chaos' plus the adjectival suffix '-ical' (rather than the more common '-ic'). This is an archaic or rare variant of 'chaotic,' following older patterns of adjective formation.
English loves creating synonyms with different suffixes—'chaotic' and 'chaotical' mean the same thing, but 'chaotical' sounds more archaic and formal, like something from a Victorian scientific paper!
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