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A proposition or theory is '''falsifiable''' if it is possible to conduct, or imagine, an experiment that could have an outcome at odds with the theory.  This is not the same as actually being false.<ref>[http://www.encyclopedia.com/doc/1O87-falsifiability.html Definition] A Dictionary of Psychology, Andrew M. Colman, via encyclopedia.com</ref>  A proposal or theory that could not possibly be shown to be false, even if it were false, is not falsifiable.  Of course, if one can conduct an experiment and it has an outcome that is at odds with the theory, then that theory is both falsifiable and demonstrably false.

A proposition or theory is '''falsifiable''' if it is possible to show that it is false if it were false.<ref>[http://www.encyclopedia.com/doc/1O87-falsifiability.html Definition] A Dictionary of Psychology, Andrew M. Colman, via encyclopedia.com</ref>  A proposal or theory that could not possibly be shown to be false, even if it were false, is not falsifiable.  Of course, if the outcome of an experiment has an outcome that disproves a theory, then that theory is both falsifiable and demonstrably false.  Many true theories are falsifiable, such as the prediction that sun will rise in the East tomorrow morning, because if that theory were false then it would be possible to show that it is false.

The interesting cases of this are propositions that are believed to be true, and can be "verified" by experiments, but the experiments in fact have no way of having a negative outcome.  This renders the experiments useless and the proposition unfalsifiable.

The interesting cases of this are propositions that are believed to be true, and can be "verified" by experiments, but the experiments in fact have no way of having a negative outcome.  This renders the experiments useless and the proposition unfalsifiable.