Source : Webster's Revised Unabridged Dictionary (1913)

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.

Source : WordNet®

magniloquent
     adj : lofty in style; "he engages in so much tall talk, one never
           really realizes what he is saying" [syn: {grandiloquent},
            {tall}]