Mystery f & m ObscureMeaning "Something secret or unexplainable; an unknown", "Someone or something with an obscure or puzzling nature". From Middle English
mysterie, from Anglo-Norman
misterie, from Old French
mistere, from Latin
mysterium, from Ancient Greek μυστήριον (
mustḗrion, "a mystery, a secret, a secret rite"), from μύστης (
mústēs, "initiated one"), from μυέω (
muéō, "I initiate"), from μύω (
múō, "I shut").