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unnatural 
1 aberrant, abnormal, anomalous, irregular, odd, perverse, perverted, unusual 
2 bizarre, extraordinary, freakish, outlandish, queer, strange, supernatural, unaccountable, uncanny 
3 affected, artificial, assumed, contrived, factitious, false, feigned, forced, insincere, laboured, mannered, phoney  or  phony  (informal) self-conscious, stagy, stiff, stilted, strained, studied, theatrical 
4 brutal, callous, cold-blooded, evil, fiendish, heartless, inhuman, monstrous, ruthless, savage, unfeeling, wicked 
 
Antonyms  
 
1 & 2 normal, ordinary, typical 
3 genuine, honest, natural, sincere, unaffected, unfeigned, unpretentious 
4 caring, humane, loving, warm