pyrrhonize
/ˈpɪrənʌɪz/verb
[no object] To practise Pyrrhonism; to doubt; to be sceptical.
Origin
Early 17th century; earliest use found in John Florio (1553–1625), author and teacher of languages. From classical Latin Pyrrhōn-, Pyrrhō + -ize, after Middle French, French pyrrhoniser.