1. Not in accordance with or determined by nature; contrary to nature
   "an unnatural death"; "the child's unnatural interest in death" 
2. Not normal; not typical or usual or regular or conforming to a norm
   - abnormal 
3. Speaking or behaving in an artificial way to make an impression
   - affected

See also: aberrant, affected, affectedness, agonistic, anomalous, antidromic, artificial, atypical, brachydactylic, brachydactylous, constrained, contrived, defective, deviant, deviate, effeteness, elocutionary, forced, freakish, hokey [N. Amer], insane, irregular, kinky, mannered, naturalness, normalcy [N. Amer], normality, paranormal, perverted, plummy, stilted, strained, studied, subnormal, supernatural, supernormal, unnaturally, unnaturalness, vicarious, violent

Antonym: natural

Encyclopedia: Unnatural

• death chamber
• death cup
• death duty
• death house
• death instinct
• death knell
• death mask
• death penalty
• death row
• death seat
• death squad
• death tax
• death toll
• Death Valley
• death warrant
• death wish
• death's head
• death's-head moth
• death-roll
• deathbed
• deathblow
• deathless
• deathlike
• deathly
• deathrate