unsubstantial vs unreal

unsubstantial and unreal both are adjectives.

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

As adjectives, unsubstantial and unreal are synonyms defined as:

Other synonyms of unsubstantial include insubstantial.

unsubstantial (adjective)	unreal (adjective)
lacking material form or substance; unreal	lacking in reality or substance or genuineness; not corresponding to acknowledged facts or criteria
	not actually such; being or seeming fanciful or imaginary
	lacking material form or substance; unreal
	contrived by art rather than nature