1. (

• cryptic ,
• cryptical ,
• deep ,
• inscrutable ,
• mysterious ,
• mystifying

) of an obscure nature; "the new insurance policy is written without cryptic or mysterious terms"; "a deep dark secret"; "the inscrutable workings of Providence"; "in its mysterious past it encompasses all the dim origins of life"- Rachel Carson; "rituals totally mystifying to visitors from other lands" ;