- Not natural.
- Not occurring in nature, the environment or atmosphere
- Going against nature; perverse.
- 1859, Ferna Vale, Natalie; or, A Gem Among the Sea-Weeds:
- Time wore heavily on with Winnie Santon, after Natalie had left them. Left as she was, much in her unnatural mother's society, who seemed to be never more pleased than when she might thwart her designs, or, in some manner act so as to make those about her uncomfortable, it was not to be wondered at, if she did sigh for other days, and a confidant, to whom she might unburden her heart.