Top Definition
Somebody who is anti-truth. Somebody who derides, vilifies, berates or otherwise insults anyone who expresses the need to investigate the 9-11 terrorist attacks on the USA further, or who belittles anyone who believes the official version of the events are at least inadequate. Somebody who is unwilling to consider evidence which goes against the official version of the events of the terrorist attacks on America. The antonym of truther.
It is common for anti-truthers to label truthers as un-American.

The campaign for 9-11 truth came up against opposition from anti-truthers.
by ubermarklar October 23, 2011

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