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"the opposite of a statement is also true" can be said as "vice versa".

Is there a way to say "the opposite of a statement is not true"?

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Unidirectional or non-conversely. –  Rigor Aug 14 '14 at 10:36

2 Answers 2

up vote 3 down vote accepted

A affects B, but not the other way around.

A affects B, but not the converse.

A affects B, but not reciprocally.

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When the opposite is true:

Jasper likes Lauren, and vice versa.

When the opposite is false:

Jasper likes Lauren, but not vice versa.

This simple negation works well.

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