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"
disapproval You can use high-sounding to describe language and ideas which seem very grand and important, especially when you think they are not really important. high-sounding decrees designed to impress foreigners and attract foreign capital. high-sounding statements, principles etc seem very impressive but are often insincere