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People usually say "it is just a myth" to indicate they either don't believe it to be true, or that they are sure it is not true. However, this is inaccurate, as myths can be true or not true, or anything in between. "Myth" only means that there is no (or just anecdotal) evidence.

How can I accurately say that something is a myth and it's false.

Edit: I edited "not true" to "false". Myths are not binary. One answer provided a definition, in the sense of something which is believed to be true but it's not. However, not true and false are not necessarily the same. To not be able to prove something to be true is not the same as proving it to be false.

What I'm specifically looking for is to express that

A) Something it a myth

B) It has been (or can be) decisively proven to be false.

The importance is to accentuate part B. To answer this, do you really require a long list of examples where a myth is ambiguous, some believe it to be true, others don't believe it but no one can decisively prove anything?

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closed as not a real question by RegDwigнt Aug 30 '12 at 8:51

It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, visit the help center.If this question can be reworded to fit the rules in the help center, please edit the question.

Closely related: Are myths superstitions – Andrew Leach Aug 30 '12 at 6:40
If, by definition, there is at most anecdotal evidence, in what sense can a myth be "true"? – shambulator Aug 30 '12 at 7:51
Please provide examples of myths that are true, of myths that are not true, and of myths that are anything in-between. Otherwise it's not clear at all what you mean. Thank you. – RegDwigнt Aug 30 '12 at 8:51
I'm sure we have a word to describe stories which have been decisively proven false, but I can't think where the answer lies. – John Clifford Mar 2 at 13:40

Going by the ODO,

Definition of myth noun

  1. traditional story, especially one concerning the early history of a people or explaining a natural or social phenomenon, and typically involving supernatural beings or events

  2. widely held but false belief or idea

So, as per sense 2, the word myth is eminently suitable :)

The adjective apocryphal can also be used to describe stories that are "of doubtful authenticity, although widely circulated as being true". Similarly, fairy tale might be suitable to describe a tale that talks of ages past and is understood to be untrue.

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+1 for apocryphal: good word, although it doesn't (quite...) suggest that the story is actually proven false. – AAT Aug 30 '12 at 7:53

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