Answer: rarefied

AnswerCrossword Clue
RAREFIEDLike some air
RAREFIEDEsoteric
RAREFIEDLofty
RAREFIEDAbstruse or very high
RAREFIEDExtremely high or elevated, as air
RAREFIEDThin
rarefiedRAREFY, to make less dense, also RARIFY
rarefiedextremely high or elevated; lofty; exalted.
rarefiedbeing less dense