— abstruse
— arcane
— cabalistic
— cabbalistic
— cryptic
— cryptical
— deep
— easterly
— eastward
— estrange
— estranged
— estuary
— exterior
— external
— extort
— extortion
— extra
— extract
— extreme
— extremely
— extremist
— extremity
— extricate
— extrinsic
— extrude
— extrusion
— extrusive
— kabbalistic
— mysterious
— mystic
— mystical
— occult
— orphic
— private
— qabalistic
— recondite
— secret
— sibylline