the mind > mental capacity > belief > uncertainty, doubt, hesitation > scepticism > [adjective] (10)
= sceptical, adj. Now rare except as the epithet of a school of philosophers (see B. 1).
Inclined to doubt, or to raise objections.
Of persons: Inclined to or imbued with scepticism (in the various senses of that word); in modern use often, dubious or incredulous.
Of aporetic nature; full of doubts and objections.