Definitions for mysteriousmɪˈstɪər i əs

Random House Webster's College Dictionary

mys•te•ri•ous^*mɪˈstɪər i əs(adj.)

involving or full of mystery:
a mysterious phone call.
suggesting or implying a mystery:
a mysterious smile.
puzzling; inexplicable:
a mysterious inscription on an ancient tomb.

^* Syn: mysterious , inscrutable , mystical , obscure refer to that which is not easily comprehended or explained. That which is mysterious , by being unknown or puzzling, excites curiosity or awe: a mysterious disease.inscrutable applies to that which is impenetrable, so enigmatic that one cannot interpret it: an inscrutable smile. That which is mystical has a secret significance, such as that attaching to certain rites or signs: mystical symbols. That which is obscure is discovered or comprehended dimly or with difficulty: obscure motives.

mys•te′ri•ous•ness(n.)

Princeton's WordNet

cryptic, cryptical, deep, inscrutable, mysterious, mystifying(adj)
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"
mysterious, mystic, mystical, occult, secret, orphic(adj)
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"

Kernerman English Learner's Dictionary

mysterious(adjective)ɪˈstɪər i əs
strange and difficult to understand
the mysterious failure of the vaccine
mysteriousɪˈstɪər i əs
unusual and exciting or interesting
a mysterious and handsome young man; Mysteriously, there was nothing left.; He spoke mysteriously of "a new way of living."

Wiktionary

mysterious(Adjective)
Of unknown origin
mysterious(Adjective)
Having unknown qualities

Webster Dictionary

Mysterious(adj)
of or pertaining to mystery; containing a mystery; difficult or impossible to understand; obscure not revealed or explained; enigmatical; incomprehensible