Someone or something that is mysterious is strange and is not known about or understood. The meaning of mysterious is of, relating to, or constituting mystery. This is reminiscent of the extraordinary relationship which amputees develop with their artificial replacements, revealing a whole inner mysterious.
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How to use mysterious in a sentence. That which is mysterious, by being unknown or puzzling, excites curiosity or awe: See examples of mysterious used in a sentence.
He died in mysterious circumstances.
Inscrutable applies to that which is. Full of, characterized by, or involving mystery.