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 …—
Robert Houston
Robert Houston
mysteriousness
noun
Synonyms of mysterious
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
Nothing is mysterious about these history-making Knicks, other than the executive who assembled them.
—Ian O'Connor, New York Times, 28 May 2026
But when a mysterious stranger begins blackmailing Neve, she is forced to compromise every legal, moral, and ethical obligation to gain an acquittal — or else risk her dark secrets being exposed.
—Matt Grobar, Deadline, 27 May 2026
In 2019, a mysterious post took off on 4chan, that ever-churning morass of anonymous commentary and internet peculiarities.
—David Sims, The Atlantic, 27 May 2026
The first reactions have landed for Steven Spielberg‘s mysterious UFO thriller Disclosure Day.
—James Hibberd, HollywoodReporter, 27 May 2026
See All Example Sentences for mysterious
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Ian O'Connor, New York Times, 28 May 2026
But when a mysterious stranger begins blackmailing Neve, she is forced to compromise every legal, moral, and ethical obligation to gain an acquittal — or else risk her dark secrets being exposed.
—Matt Grobar, Deadline, 27 May 2026
In 2019, a mysterious post took off on 4chan, that ever-churning morass of anonymous commentary and internet peculiarities.
—David Sims, The Atlantic, 27 May 2026
The first reactions have landed for Steven Spielberg‘s mysterious UFO thriller Disclosure Day.
—James Hibberd, HollywoodReporter, 27 May 2026
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 May. 2026.
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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