What does "Unnatural" mean?
(a.) Not natural; contrary, or not conforming, to the order of nature; being without natural traits; as, unnatural crimes
eerie, uncanny, affected, grotesque, contrived, artificial, ugly, stilted, spooky, violent, strained, monstrous, constrained, eery, unco, forced, agonistic, plummy, mannered, elocutionary
Example: "An unnatural death"