1. Of a person: lofty, ambitious, or pompous in expression; grandiloquent. Hence of utterances, compositions, etc. Also (occas.): boastful.
The Lexicon of Cultural Folly contains many magniloquent words, like bombastic, ideopathic, and pulchritudinous, but also some of a more humble and playful nature, like doohickey, gadzooks, and funambulist.
Synonyms: boastful, bombastic, flowery, grandiloquent, pompous, turgid.