Synonyms of mysterious

Adjective

1. cryptic, cryptical, deep, inscrutable, mysterious, mystifying, inexplicable (vs. explicable), incomprehensible

usage: 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"

2. mysterious, mystic, mystical, occult, secret, orphic, esoteric (vs. exoteric)

usage: having an import not apparent to the senses nor obvious to the intelligence; beyond ordinary understanding; "mysterious symbols"; "the mystical style of Blake"; "occult lore"; "the secret learning of the ancients"

Definition and meaning of mysterious (Dictionary)