Relating to or characteristic of archaism or archaists; resembling or imitating ancient language and styles.
From 'archaist' plus the suffix '-ic,' creating an adjective form. This formation follows the pattern of turning nouns into descriptive words (like 'piano' to 'pianistic').
Medieval writers weren't actually being archaistic when they wrote in medieval language—they were just writing current language! But modern authors deliberately using 'thee' and 'thou' are genuinely archaistic.
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