gnostic

From Ancient Greek γνωστικός (gnōstikós, “relating to knowledge or knowing”), from the root of verb γιγνώσκω (gignṓskō, “to come to know, to learn”) + -τῐκός (-tĭkós) or from γνῶσις (gnôsis, “knowledge, knowing”) + -κός (-kós, adjective suffix), depending upon the analysis.