mysterious

mys·te·ri·ous  (m-stîr-s)

adj.

1. Of, relating to, or being a mystery: mysterious and infinite truths.

2. Simultaneously arousing wonder and inquisitiveness, and eluding explanation or comprehension: a mysterious visitor; mysterious conduct.

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[French mystérieux, from mystère, secret, from Latin mystrium; see mystery¹.]

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mys·teri·ous·ly adv.

mys·teri·ous·ness n.

Synonyms: mysterious, esoteric, arcane, occult, inscrutable
These adjectives mean beyond human power to explain or understand. Something mysterious arouses wonder and inquisitiveness: "The sea lies all about us.... In its mysterious past it encompasses all the dim origins of life" Rachel Carson.
What is esoteric is mysterious because only a select group knows and understands it: a compilation of esoteric philosophical essays.
Arcane applies to what is hidden from general knowledge: arcane economic theories.
Occult suggests knowledge reputedly gained only by secret, magical, or supernatural means: an occult rite.
Something that is inscrutable cannot be fathomed by means of investigation or scrutiny: "It is not for me to attempt to fathom the inscrutable workings of Providence" Earl of Birkenhead.

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mysterious

Adjective

1. of unknown cause or nature: a mysterious illness

2. creating a feeling of strangeness, curiosity, or wonder: a fascinating and mysterious old woman

mysteriously adv

Thesaurus

Adj.	1.	mysterious - 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" cryptic, cryptical, inscrutable, mystifying, deep incomprehensible, inexplicable - incapable of being explained or accounted for; "inexplicable errors"; "left the house at three in the morning for inexplicable reasons"
	2.	mysterious - 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" mystic, occult, orphic, mystical, secret esoteric - confined to and understandable by only an enlightened inner circle; "a compilation of esoteric philosophical theories"

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mysterious

adjective 1. strange, unknown, puzzling, curious, secret, hidden, weird, concealed, obscure, baffling, veiled, mystical, perplexing, uncanny, incomprehensible, mystifying, impenetrable, arcane, inexplicable, cryptic, insoluble, unfathomable, abstruse, recondite << OPPOSITE clear

adjective 2. secretive, enigmatic, evasive, discreet, covert, reticent, furtive, inscrutable, non-committal, surreptitious, cloak-and-dagger, sphinx-like

Translations

mysterious [mɪsˈtɪərɪəs] adj → misterioso

mysterious [mɪsˈtɪərɪəs] adj → mystérieux/euse

mysterious [mɪsˈtɪərɪəs] adj → geheimnisvoll, mysteriös

mysterious [mɪsˈtɪərɪəs] adj → misterioso/a