Source : Webster's Revised Unabridged Dictionary (1913)

High-sounding \High"-sound`ing\, a.
   Pompous; noisy; ostentatious; as, high-sounding words or
   titles.

Source : WordNet®

high-sounding
     adj : pretentious (especially with regard to language or ideals);
           "high-flown talk of preserving the moral tone of the
           school"; "a high-sounding dissertation on the means to
           attain social revolution" [syn: {high-flown}, {inflated}]