Unbackable definitions

Unbackable

A horse which is quoted at such extremely short odds that investors decide it is too short to return a reasonable profit for the risk involved.[6]
Found on http://en.wikipedia.org/wiki/Glossary_of_Australian_and_New_Zealand_punting

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Unbackable

A horse which is quoted at short odds that punters decide is too short to return any reasonable amount for the money they outlay.
Found on http://www.encyclo.co.uk/local/21627

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Unbackable

A horse which is quoted at such extremely short odds that investors decide it is too short to return a reasonable profit for the risk involved.
Found on http://www.translationdirectory.com/glossaries/glossary152.htm

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