Mysterious stains on clothes in closet, See examples of mysterious used in a sentence. suggesting or implying a mystery: a mysterious smile. The whole thing was very mysterious. 3. Jan 20, 2026 · Adjective mysterious (comparative more mysterious, superlative most mysterious) Of unknown origin. Definition of mysterious adjective from the Oxford Advanced Learner's Dictionary. The whole thing seems very mysterious. puzzling; inexplicable: a mysterious inscription on an ancient tomb. involving or full of mystery: a mysterious phone call. Someone or something that is mysterious is strange and is not known about or understood. Fate works in mysterious ways. Having unknown qualities. How to use mysterious in a sentence. The meaning of MYSTERIOUS is of, relating to, or constituting mystery. . Synonym: untraceable He received a mysterious phone call this morning. A mysterious illness is affecting all the animals. MYSTERIOUS definition: full of, characterized by, or involving mystery. The costume is mysterious in its poverty as well as in its flair for incoherent details. difficult to understand or explain; strange. The meaning of MYSTERIOUS is of, relating to, or constituting mystery. A mysterious illness confined him to bed for over a month. 1. He died in mysterious circumstances. 2.


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