Inverse

1. 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)”

2. adjective

   reversed (turned backward) in order or nature or effect

   Similar: reverse

3. noun

   something inverted in sequence or character or effect

   “when the direct approach failed he tried the inverse”

   Similar: opposite