The best replacement for opposite is alternate leaves.

The best alternatives to opposite are rated as following:
★★★★★  alternate leaves
★★★★  adjacent
★★★  additive inverse
★  alternate
★  contrary
★  inverse
★  additive inverses
★  in front of
★  across
★  across from
★  reciprocal
  negation
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  opposing
  apposite

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Speaking about opposite, one probably shouldn't forget about un.

Other search terms related to opposite and their ratings are:
★★★★★ un
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opposite
alternate leaves
adjacent