mysterious
adjective
mys·te·ri·ous
mi-ˈstir-ē-əs 
1
a
: of, relating to, or constituting mystery
the mysterious ways of God
b
: exciting wonder, curiosity, or surprise while baffling efforts to comprehend or identify : mystifying
heard a mysterious noise
a mysterious stranger
a mysterious plane crash
a mysterious illness
2
: stirred by or attracted to the inexplicable
… to help a mysterious wizard … ward off the end of the world with blood sacrifices.—
Robert Houston
Robert Houston
mysteriousness
noun
Examples of mysterious in a Sentence
the mysterious ways of nature
We heard a mysterious noise outside our tent.
He died under mysterious circumstances.
A mysterious illness has been spreading through the city.
There's something mysterious about that old woman.
Her behavior was very mysterious.
Recent Examples on the Web
Featuring a wealth of interviews, Joan Bonfill’s intimate and insightful documentary portrait delves into the mysterious chemistry of creative collaboration.
—Christian Blauvelt, IndieWire, 30 Sep. 2025
The mysterious laser weapon was displayed at China’s Victory Day parade in Beijing in September, and since then, speculations have been rife over its capabilities.
—Abhishek Bhardwaj, Interesting Engineering, 30 Sep. 2025
Momo’s mysterious origin as a young girl who appeared without a family makes for an intriguing departure point.
—Carlos Aguilar, Variety, 30 Sep. 2025
Here's a look inside her mysterious death.
—Kelsey Lentz, PEOPLE, 30 Sep. 2025
See All Example Sentences for mysterious
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Christian Blauvelt, IndieWire, 30 Sep. 2025
The mysterious laser weapon was displayed at China’s Victory Day parade in Beijing in September, and since then, speculations have been rife over its capabilities.
—Abhishek Bhardwaj, Interesting Engineering, 30 Sep. 2025
Momo’s mysterious origin as a young girl who appeared without a family makes for an intriguing departure point.
—Carlos Aguilar, Variety, 30 Sep. 2025
Here's a look inside her mysterious death.
—Kelsey Lentz, PEOPLE, 30 Sep. 2025
See All Example Sentences for mysterious
Cite this Entry
“Mysterious.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/mysterious. Accessed 2 Oct. 2025.
Copy CitationKids Definition
mysterious
adjective
mys·te·ri·ous
mis-ˈtir-ē-əs
: containing, suggesting, or presenting a mystery
mysterious noises
also
: difficult or impossible to understand
the mysterious ways of nature
mysteriously
adverb
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