magniloquently

from WordNet (r) 3.0 (2006)

magniloquently
    adv 1: in a rhetorically grandiloquent manner; "the orator spoke
           magniloquently" [syn: {grandiloquently},
           {magniloquently}]

from The Collaborative International Dictionary of English v.0.48

Magniloquent \Mag*nil"o*quent\, a. [L. magnus great + loquens,
   -entis, p. pr. of loqui to speak. See {Magnitude},
   {Loquacious}.]
   Speaking pompously; using swelling discourse; bombastic;
   tumid in style; grandiloquent. -- {Mag*nil"o*quent*ly}, adv.
   [1913 Webster]