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
More Miguel Rodriguez/Getty Images What's so mysterious about a team playing well?
—Jon Vankin, MSNBC Newsweek, 26 July 2025
Years after gaining superpowers from being bombarded by cosmic rays in space, the astronauts-turned-superheroes face a new threat when the mysterious Silver Surfer, Shalla-Bal (Julia Garner), heralds the coming of the world-devouring Galactus (Ralph Ineson).
—Brian Truitt, USA Today, 26 July 2025
In season 2, John Doe (Mackie) and Quiet enter the Twisted Metal tournament, a sinister demolition derby hosted by a mysterious man known as Calypso (Carrigan).
—EW.com, 25 July 2025
Meyer, whose previous credits include roles on ABC’s American Housewife and Disney Channel’s Girl Meets World, joined Days of Our Lives in December 2024, playing a mysterious young man who shocked Julie by revealing himself to be her late husband’s estranged grandson.
—Andy Swift, TVLine, 25 July 2025
See All Example Sentences for mysterious
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Jon Vankin, MSNBC Newsweek, 26 July 2025
Years after gaining superpowers from being bombarded by cosmic rays in space, the astronauts-turned-superheroes face a new threat when the mysterious Silver Surfer, Shalla-Bal (Julia Garner), heralds the coming of the world-devouring Galactus (Ralph Ineson).
—Brian Truitt, USA Today, 26 July 2025
In season 2, John Doe (Mackie) and Quiet enter the Twisted Metal tournament, a sinister demolition derby hosted by a mysterious man known as Calypso (Carrigan).
—EW.com, 25 July 2025
Meyer, whose previous credits include roles on ABC’s American Housewife and Disney Channel’s Girl Meets World, joined Days of Our Lives in December 2024, playing a mysterious young man who shocked Julie by revealing himself to be her late husband’s estranged grandson.
—Andy Swift, TVLine, 25 July 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 29 Jul. 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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