unsubstantial vs ethereal

unsubstantial and ethereal both are adjectives.

Word	Noun	Adjective	Verb	Adverb
unsubstantial	No	Yes	No	No
ethereal	No	Yes	No	No

unsubstantial (adjective)	ethereal (adjective)
lacking material form or substance; unreal	of or containing or dissolved in ether
	characterized by unusual lightness and delicacy
	of heaven or the spirit
	characterized by lightness and insubstantiality; as impalpable or intangible as air