inverse

Adjective

• opposite in nature or effect or relation to another quantity
  • a term is in inverse proportion to another term if it increases (or decreases) as the other decreases (or increases)
    

• reversed (turned backward) in order or nature or effect

Noun

• something inverted in sequence or character or effect
  • when the direct approach failed he tried the inverse
    

Related words

• Synonyms: 
  reverse , opposite