rarefied

(s) having low density
- rare gasses
- lightheaded from the rarefied mountain air
rarified, rare,
(s) 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
exalted, high-minded, lofty, noble-minded, elevated, high-flown, idealistic, rarified, sublime, grand,

rarified rare exalted high-minded lofty noble-minded elevated high-flown idealistic sublime grand