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
In The Old Guard 2, following on from the climax of the first film, Andy must come to terms with her newfound mortality while preparing to face a mysterious foe (played by Uma Thurman).
—Abid Rahman, HollywoodReporter, 1 July 2025
Before long, his life is plagued by a series of mysterious, sinister incidents that threaten to upend his success and bring about a most violent demise.
—Ryan Lattanzio, IndieWire, 1 July 2025
Two Missouri men already facing charges in the mysterious case of three friends found dead outside a Kansas City home after watching a Chiefs football game last year could have some charges upgraded to include three counts of second degree murder, court documents show.
—Amanda Musa, CNN Money, 30 June 2025
Still, there are things for franchise diehards to enjoy, including information about the mysterious Section 31 and about the woman who would later call Kirk her baby daddy.
—Chris Snellgrove, EW.com, 30 June 2025
See All Example Sentences for mysterious
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Abid Rahman, HollywoodReporter, 1 July 2025
Before long, his life is plagued by a series of mysterious, sinister incidents that threaten to upend his success and bring about a most violent demise.
—Ryan Lattanzio, IndieWire, 1 July 2025
Two Missouri men already facing charges in the mysterious case of three friends found dead outside a Kansas City home after watching a Chiefs football game last year could have some charges upgraded to include three counts of second degree murder, court documents show.
—Amanda Musa, CNN Money, 30 June 2025
Still, there are things for franchise diehards to enjoy, including information about the mysterious Section 31 and about the woman who would later call Kirk her baby daddy.
—Chris Snellgrove, EW.com, 30 June 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 14 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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