Depending on the context, synonyms might include "polysyllabic", "flowery" (language), or the equally ponderous "grandiloquent".
A "sesquipedalian".
As he spoke endlessly , the word sesquipedalian came to mind to describe him.
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The word sesquipedalian means to use large words. Another word is verbose. Someone who uses unfamiliar words could be called pretentious.
Sesquipedalian describes a very, very long word.
Smart.
empower
sweetheart
fix
concensus
citrus