grandiloquent
Concise Oxford English Dictionary © 2008 Oxford University Press:
grandiloquent /granˈdɪləkwənt/
▶adjective pompous or extravagant in language, style, or manner.
– derivatives
grandiloquence noun,
grandiloquently adverb.
grandiloquence noun,
grandiloquently adverb.
– origin C16: from L. grandiloquus, lit. ‘grand-speaking’; the ending was altered in English by assoc. with eloquent.
'grandiloquent' also found in these Oxford entries:

