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Definition of unnatural : Not natural; contrary, or not conforming, to the order of nature; being without natural traits; as, unnatural crimes.

Synonyms:

sublime, constrained, manufactured, weird, Herculean, outlandish, pseudo, unaccountable, unorthodox, eccentric, deviant, plummy, quirky, outrageous, divergent, preposterous, miraculous, aberrant, plastic, unusual, idiosyncratic, incredible, queer, ordinary, marvelous, spooky, curious, eerie, usual, phenomenal, moved, factitious, inhuman, elocutionary, eery, touched, erratic, spurious, wonderful, common, bizarre, strained, atypic, anomalistic, anomalous, rummy, savage, malformed, cranky, good, put-on, violent, freakish, cruel, strange, kooky, abnormal, odd, rum, quaint, agonistic, natural, ugly, supernatural, stirred, peculiar, honest, atypical, unco, contrived, irregular, uncanny, singular, grotesque, monstrous, preternatural, screwball

forged, mannered, facade, stilted, false, impersonating, bogus, mock, ersatz, theatrical, affected, imitation, counterfeit, deceitful, studied, pretentious, fraudulent, synthetic, la-di-da, overdone, histrionic, posing, imposture, artificial, forced, fake, showy, stagy, ostentatious, masquerading, stiff

Usage examples:

• The young man waited to hear no more, but mechanically followed Hetty to his room, starting and turning pale as a wild, unnatural laugh fell on his ear. - "'Lena Rivers", Mary J. Holmes.
• I hate to see London people in unnatural clothes. - "This Is the End", Stella Benson.
• I solemnly swear,- I solemnly swear,- Mr. Delamere's voice might have come from the tomb, so hollow and unnatural did it sound. - "The Marrow of Tradition", Charles W. Chesnutt.