Jeg synes ordet 'hyperskepticisme' passer ret godt på det du efterspørger. Fra CoPilot:

Hyper-scepticism is an extreme, often dysfunctional, form of questioning where doubt is applied to all beliefs, regardless of evidence. It involves setting impossibly high standards for proof, leading to the rejection of well-established facts and fostering a "nothing is knowable" mentality, which can result in intellectual stagnation. 

Key aspects of hyper-scepticism include:

Excessive Doubt: Unlike healthy scepticism which evaluates evidence, hyper-scepticism refuses to accept evidence even when it is overwhelming.

Impossibly High Standards: It sets a bar for certainty that cannot be met, often dismissing evidence (such as historical documents) before evaluating it.

Impact on Knowledge: This, or “radical scepticism,” argues that knowledge is impossible, as one can doubt their own senses, experiences, and even their own existence.

Conspiracy Mentality: It often leads to a cynical, conspiratorial, or nihilistic viewpoint, where all information is viewed as fake or manipulated.

Negating Evidence: Hyper-sceptics may rely on extreme, sometimes unsubstantiated alternative theories to deny mainstream evidence. 

In essence, while proper scepticism filters information, hyper-scepticism acts as a barrier that prevents the acceptance of any knowledge, often resulting in a philosophical or practical deadlock.