grandiloquence (Aristophanes)

To make your study grandiloquence
And busy quibbling devoid of sense
Argues an empty mind and sick,
In point of fact a lunatic.

- Frogs, Aristophanes

*grandiloquence = grandiosity: high-flown style; excessive use of verbal ornamentation; "the grandiosity of his prose"; "an excessive ornateness of language"
per http://wordnetweb.princeton.edu/perl/webwn?s=grandiloquence