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Webster 1913 Edition

Adj.

[L.

altus

(adv.

alte

) high +

loquens

, p. pr. of

loqui

to speak.]

High-sounding; pompous in speech.

[R.]

Bailey.

altiloquent ‎(comparative more altiloquent, superlative most altiloquent)

Pompous, or pretentious in speech
- 1976, John Gardner, Jason and Medeia, Ballantine Books
  [T]hey listened, dazzle-eyed- secretly making lists- to grandly romantic trash: bad poetry, stupid theology- altiloquent designs in the empty air.
- 1921, Holman Day, All Wool Morrison, Kessinger Publishing
  He remembered that the politeness seemed too elaborate, too florid, altiloquent to the extent of insincerity.

pompous or pretentious in speech