rarefied

动词 rarefy:

1. lessen the density or solidity of
   同义词：rarefy
2. make more subtle or refined
   同义词：rarefy, sublimate, subtilize
3. weaken the consistency of (a chemical substance)
   同义词：rarefy, attenuate

形容词 rarefied:

1. having low density
   同义词：rare, rarified
2. reserved for an elite group
   同义词：rarified
3. of high moral or intellectual value; elevated in nature or style
   同义词：exalted, sublime, grand, high-flown, high-minded, lofty, rarified, idealistic, noble-minded