From Longman Dictionary of Contemporary Englishhigh-soundingˌhigh-ˈsounding adjective [only before noun] PRETENDhigh-sounding statements, principles etc seem very impressive but are often insincere
Examples from the Corpus
high-sounding• The elaborately staged conferences have acquired a reputation for issuing high-sounding communiques urging remedial economic or monetary action.• Quigly, Willis and Frome - it would have formed a sufficiently high-sounding trio of names to grace a solicitors' firm.• It was also due to a barbaric delight in high-sounding verbiage, and probably this was the most powerful reason for its use. 