unnatural

Synonyms: aberrant abnormal affected anomalous assumed bizarre concocted contrary contrived ersatz extraordinary fabricated factitious false feigned forced freakish freaky imitation incredible insincere irregular labored made-up make-believe odd outlandish outrageous perverse perverted phony preposterous pseudo put-on queer staged stiff stilted strained strange studied supernatural synthetic theatrical unaccountable uncanny unconforming unorthodox unusual

Antonyms: acceptable genuine natural real