ˈpirəˌnizəm noun
( -s )
Usage: usually capitalized
Etymology: French pyrrhonisme, from Pyrrhon Pyrrho (from Greek Pyrrhōn ) + -isme -ism
1. : the doctrines of the founder of a school of skeptics in Greece (about 365-275 B.C.) who taught that all perceptions are of doubtful validity, that the external circumstances of life are therefore unimportant to the wise man, and that he should consequently always preserve tranquillity of mind
2. : skepticism especially when total or radical