"ghosts and other unreal entities"
"unreal propaganda serving as news"

"this conversation is getting more and more unreal"
"the fantastically unreal world of government bureaucracy"
"the unreal world of advertising art"

"artificial flowers"
"artificial flavoring"
"an artificial diamond"
"artificial fibers"
"artificial sweeteners"

"as insubstantial as a dream"
"an insubstantial mirage on the horizon"