not genuine, authentic, or true; not from the claimed, pretended, or proper source; counterfeit.

Biology . (of two or more parts, plants, etc.) having a similar appearance but a different structure.

of illegitimate birth; bastard.

adjective

authentic , genuine , real , true

adjective

affected , apocryphal , artificial , assumed , bastard * , bent , bogus , bum , contrived , deceitful , deceptive , dummy * , ersatz , faked , false , feigned , forged , framed , illegitimate , imitation , make-believe , mock , phony , pirate , pretend , pretended , pseudo * , put-on , sham * , simulated , specious , substitute , unauthentic , ungenuine , unreal , fake , fraudulent , sham , suppositious , supposititious , illogical , invalid , sophistic , unsound , counterfactual , truthless , untrue , untruthful , wrong , baseborn , bastard , misbegotten , natural , unlawful , adulterine , counterfeit , fictitious , inauthentic , meretricious , pinchback , pseudepigraphic , pseudo