WordNet sense 1 (lacking the properties characteristic of living organisms):

inorganic

WordNet sense 2 (lacking substance or vitality as if produced by painting):

painted

WordNet sense 3 (not of natural origin; prepared or made artificially):

synthetic

WordNet sense 4 (not genuine or real; being an imitation of the genuine article):

false

WordNet sense 5 (not produced by natural forces):

factitious

WordNet sense 6 (artificial and inferior):

ersatz, substitute

WordNet sense 7 (contrived by art rather than nature):

unreal

WordNet sense 8 (artificially formal):

contrived, hokey, stilted

WordNet sense 9 (speaking or behaving in an artificial way to make an impression):

affected, unnatural