Unnatural \Un*nat"u*ral\ (?; 135), a. Not natural; contrary, or not conforming, to the order of nature; being without natural traits; as, unnatural crimes. [1913 Webster] Syn: See {Factitious}. [1913 Webster] -- {Un*nat"u*ral*ly}, adv. -- {Un*nat"u*ral*ness}, n. [1913 Webster]