Source : Webster's Revised Unabridged Dictionary (1913)

Grandiloquence \Gran*dil"o*quence\, n.
   The use of lofty words or phrases; bombast; -- usually in a
   bad sense.

         The sin of grandiloquence or tall talking. --Thackeray,

Source : WordNet®

grandiloquence
     n : high flown style; excessive use of verbal ornamentation
         [syn: {grandiosity}, {magniloquence}, {rhetoric}]