scepsis
Skepticism; a skeptical approach or belief.
uncommon, uncountable
Among their products were the system of Locke, the scepsis of Hume, the critical philosophy of Kant.
Where it comes from
From Latinized form of Ancient Greek σκέψις (sképsis, “examination, observation, consideration”). See skeptic.
Adapted from the Wiktionary entry scepsis (CC BY-SA 4.0).