Epistemic: of or relating to knowledge.
We couldn’t in a thousand lifetimes discover and evaluate the evidence, and counter-evidence, for most of the beliefs we hold. And most often, we wouldn’t if we could. Don’t believe me? Make a list of 200 beliefs you hold, and consider for how many and to what extent you’ve expended one iota of epistemic labour. Be honest. You’ve slacked off a bit. But don’t despair, this negligence is not usually a sign of moral or intellectual shortcoming. Rather, it means you’re human. That said, remember this: if you are going to let yourself off the hook for your epistemic sloth, decency dictates you do the same for your interlocutor.