high-flown

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"

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"