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1.
A false truth is something believed by many people to be true but is not. It is usually something that cannot be backed up with hard evidence.
Many people in countries governed by Islamic law share a common false truth that women are not as mentally capable of men.
by sweet96635 October 26, 2011
 
2.
A very subtle lie that most would not be able to determine whether it is true or not
We do not all see colours in the same way as each other. <-- False truth
by Grammatical Ninja May 17, 2011