mysterious

Adjective

Synonyms: cryptic cryptical deep inscrutable mystifying mystic mystical occult secret orphic

WordNet 3.0

Adjective (2)

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”Synonyms: cryptic cryptical deep inscrutable mystifying
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”Synonyms: mystic mystical occult secret orphic

Webster's Dictionary (GCIDE)

Mysterious \Mys*te"ri*ous\, a. [F. myst[`e]rieux. See 1st Mystery.] Of or pertaining to mystery; containing a mystery; difficult or impossible to understand; inexplicable; obscure; not revealed or explained; enigmatical; incomprehensible. [1913 Webster]

God at last To Satan, first in sin, his doom applied, Thought in mysterious terms. --Milton. [1913 Webster]

Syn: Obscure; secret; occult; dark; mystic; cabalistic; enigmatical; unintelligible; inexplicable; incomprehensible. [1913 Webster]