not natural or normal
not regular; artificial
Cases of word usage
1) in an unnatural deep sleep because of injury or illness (coma)
2) strange, ugly and unnatural (grotesque)
3) the act of perverting or being perverted; a change from right to wrong, to something abnormal, unnatural etc (perversion)
4) (of written style, talk, behaviour etc) too formal and unnatural (stilted)