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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

3 Answers 3

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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I'm not a Latin expert but how about "vice non versa"

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If that's not a phrase, it should be! –  Pete855217 Sep 23 at 14:24
Please edit your answer to explain why this would be a good choice. –  Matt E. Эллен Sep 24 at 12:15
This does not provide an answer to the question. To critique or request clarification from an author, leave a comment below their post - you can always comment on your own posts, and once you have sufficient reputation you will be able to comment on any post. –  DJClayworth Sep 25 at 13:29

protected by tchrist Sep 24 at 14:09

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