rarefied

(verb) lessen the density or solidity of. Synonyms: rarefy. Example: "The bones are rarefied."

(verb) make more subtle or refined. Synonyms: rarefy, sublimate, subtilize.

(verb) weaken the consistency of (a chemical substance). Synonyms: rarefy, attenuate.

(adj) having low density. Synonyms: rare, rarified. Examples: "Rare gasses." "Lightheaded from the rarefied mountain air."

(adj) of high moral or intellectual value; elevated in nature or style. Synonyms: exalted, elevated, sublime, grand, high-flown, high-minded, lofty, rarified, idealistic, noble-minded. Examples: "An exalted ideal." "Argue in terms of high-flown ideals"- oliver franks." "A noble and lofty concept." "A grand purpose."