Synonym: hidden, mystical, occult, profound, recondite, secret. Similar words: various, curious, oyster, laboriously, interior, esterification, step by step, period. Meaning: [mɪ'stɪrɪəs /mɪ'stɪə-] 
adj. 1. of an obscure nature 2. having an import not apparent to the senses nor obvious to the intelligence; beyond ordinary understanding.
adj. 1. of an obscure nature 2. having an import not apparent to the senses nor obvious to the intelligence; beyond ordinary understanding. 
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1. He died in mysterious circumstances.
2. A mysterious illness is affecting all the animals.
3. The mysterious woman passenger vanished.
4. The ship sank in mysterious circumstances.
5. There have been a mysterious visitor in the office.
6. He is entangled with a mysterious man.
7. The distant mountains looked hazy and mysterious.
8. She wondered who'd sent her the mysterious email.
9. His action was very mysterious.
10. He was being very mysterious, and wouldn't tell me what he was up to.
11. The papers ran speculative stories about the mysterious disappearance of Eddie Donagan.
12. The police are investigating the mysterious deaths of children at the hospital.
13. A mysterious young woman is living next door.
14. Sophie's curiosity was aroused by the mysterious phone call.
15. I felt drawn to this mysterious stranger.
16. Helen's being very mysterious about her plans.
17. There's something mysterious going on.
18. He was darkly sensual and mysterious.
19. She hid her thoughts behind a mysterious smile.
20. They're being very mysterious about their holiday plans.
21. The mysterious rider dissolved into the mists.
22. The whole thing seems very mysterious.
23. God works in mysterious ways.
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24. Soon they were dead, victims of a mysterious poisoner.
25. He was very mysterious in his manner.
26. They described me to be a mysterious person.
27. Benson later disappeared in mysterious circumstances .
28. He was being very mysterious about where he was going.
29. One day , a mysterious stranger called at the house.
30. All the rose bushes seem to be suffering from the same mysterious malady.
More similar words: various, curious, oyster, laboriously, interior, esterification, step by step, period, system, ecosystem, solar system, envious, anxious, dubious, obvious, previous, officious, oblivious, bumptious, vivacious, obviously, ambitious, previously, suspicious, pugnacious, loquacious, subconsciously, consciousness, foster, poster.