aporia

noun, plural a·po·ri·as, a·po·ri·ae [uh–pawr-ee-ee, uh–pohr-] /əˈpɔr iˌi, əˈpoʊr-/.

1. Rhetoric. the expression of a simulated or real doubt, as about where to begin or what to do or say.
2. Logic, Philosophy. a difficulty encountered in establishing the theoretical truth of a proposition, created by the presence of evidence both for and against it.

noun

1. rhetoric a doubt, real or professed, about what to do or say
2. philosophy puzzlement occasioned by the raising of philosophical objections without any proffered solutions, esp in the works of Socrates