The meaning of MYSTERIOUS is of, relating to, or constituting mystery. How to use mysterious in a sentence.

The costume is mysterious in its poverty as well as in its flair for incoherent details.

Mysterious, inscrutable, mystical, obscure refer to that which is not easily comprehended or explained. That which is mysterious, by being unknown or puzzling, excites curiosity, …

1. involving or full of mystery: a mysterious phone call. 2. suggesting or implying a mystery: a mysterious smile. 3. puzzling; inexplicable: a mysterious inscription on an ancient tomb.

Someone or something that is mysterious is strange and is not known about or understood. He died in mysterious circumstances. A mysterious illness confined him to bed for over a month. …

Definition of mysterious adjective from the Oxford Advanced Learner's Dictionary. difficult to understand or explain; strange. He died in mysterious circumstances. Fate works in …

Nov 28, 2025 · mysterious (comparative more mysterious, superlative most mysterious) Of unknown origin. synonym Synonym: untraceable He received a mysterious phone call this …

mysterious definition: difficult or impossible to understand or explain. Check meanings, examples, usage tips, pronunciation, domains, and related words. Discover expressions like "mysterious …

3 days ago · Politicians joined in the fervor over apparent drone sightings. While the wave of fear has passed, details about what happened remain elusive.

There are eight meanings listed in OED's entry for the word mysterious, three of which are labelled obsolete. See ‘Meaning & use’ for definitions, usage, and quotation evidence.