In modern colloquial Chinese, 玄 often means 'dubious' or 'unreliable' (太玄了 = sounds fishy). In classical/philosophical contexts, it means 'profound' or 'mysterious' (玄学 = metaphysics).
culture
玄 is a key concept in Daoism. The opening of the 道德经 says 玄之又玄 (mysterious and more mysterious), referring to the ineffable nature of the Dao.
