gnostic

adjective1

1. •
   (slang, no longer used) knowing; wise; shrewd

   • I said you were a d—d gnostic fellow. — 1823

adjective2

1. •
   Of, or relating to, intellectual or spiritual knowledge
2. •
   Of, or relating to Gnosticism

noun1

1. •
   A believer in Gnosticism