Pyrrhonism /ˈpɪɹənɪz(ə)m/ noun1 •The system of skeptical philosophy established by Pyrrho of Elis, centred on the idea that nothing can be known for certain; widespread skepticism, universal doubt.Whosoever shall imagine a perpetuall confession of ignorance, and a judgement upright and without staggering, to what occasion soever may chance; That man conceives the true Phyrrhonisme. — 1603 formsPyrrhonisms