high-flown

adjectives

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"
high-flown, high-sounding, inflated
of high moral or intellectual value; elevated in nature or style
"an exalted ideal"; "argue in terms of high-flown ideals"- Oliver Franks; "a noble and lofty concept"; "a grand purpose"
elevated, exalted, grand, high-flown, high-minded, idealistic, lofty, noble-minded, rarefied, rarified, sublime