Open English Wordnet
Adjectives
(a)artificial, unrealcontrived by art rather than nature“artificial flowers”, “artificial flavoring”, “an artificial diamond”, “artificial fibers”, “artificial sweeteners”
(a)insubstantial, unsubstantial, unreallacking material form or substance; unreal“as insubstantial as a dream”, “an insubstantial mirage on the horizon”