inverse

(noun) something inverted in sequence or character or effect. Synonyms: opposite. Example: "When the direct approach failed he tried the inverse."

(adj) reversed (turned backward) in order or nature or effect. Synonyms: reverse.

(adj) opposite in nature or effect or relation to another quantity . Synonyms: inverse (vs. direct). Example: "A term is in inverse proportion to another term if it increases (or decreases) as the other decreases (or increases)."