WordNet records no synonym and no antonym for euphuism. It is the only member of each of its synsets, which is common for technical, taxonomic and single-sense vocabulary — there is no other English word that means the same thing. The broader and narrower terms below are the useful relations in that case.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
any artificially elegant style of language
an elegant style of prose of the Elizabethan period; characterized by balance and antithesis and alliteration and extended similes with and allusions to nature and mythology
Synonyms, antonyms and the broader and narrower relations for euphuism come from Princeton University’s WordNet. Full sources and licences.