Relating to, consisting of, or having the character of apothegms; expressing wisdom in brief, memorable, and pointed statements.
From apothegm plus -ical (variant of -atic), which is a common way to form adjectives in English. The double suffix creates emphasis on the apothegmatic quality.
This word is delightfully old-fashioned—18th-century writers loved piling on suffixes, so instead of just 'apothegmatic,' they'd say 'apothegmatical' to sound extra erudite and wise!
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