lambent (en)

(adjective) playing lightly on or over a surface; flickering / (adjective) softly bright or radiant / (adjective) marked by lightness or brilliance especially of expression

rarefied (en)

(adjective) being less dense / (adjective) of, relating to, or interesting to a select group; esoteric / (adjective) very high / (verb) to make rare, thin, porous, or less dense; to expand without the addition of matter / (verb) to make more spiritual, refined, or abstruse / (verb) to become less dense