inverse (adj.)

"turned in the opposite direction, having an opposite course or tendency," in early use also enverse, mid-15c., from Latin inversus, past participle of invertere "turn about, turn upside-down, upset, reverse, invert" (see invert). Related: Inversely. As a noun, "inverted state or condition," 1680s, from the adjective.

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Definitions of inverse from WordNet
inverse (adj.)
reversed (turned backward) in order or nature or effect;
Synonyms: reverse
inverse (adj.)
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)
inverse (n.)
something inverted in sequence or character or effect;
when the direct approach failed he tried the inverse
Synonyms: opposite