rarefied

Adjective

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

WordNet 3.0

Adjective (2)

having low density“rare gasses”“lightheaded from the rarefied mountain air”Synonyms: rare rarified
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”Synonyms: exalted elevated sublime grand high-flown high-minded lofty rarified idealistic noble-minded

Webster's Dictionary (GCIDE)

Rarefy \Rar"e*fy\ (r[a^]r"[-e]*f[imac]; 277), v. t. [imp. & p. p. Rarefied (r[a^]r"[-e]*f[imac]d); p. pr. & vb. n. Rarefying (r[a^]r"[-e]*f[imac]`[i^]ng).] [F. rar['e]fier; L. rarus rare + -ficare (in comp.) to make; cf. L. rarefacere. See -fy.] To make rare, thin, porous, or less dense; to expand or enlarge without adding any new portion of matter to; -- opposed to condense. [1913 Webster]