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
But neither even comes close to what might be the marquee scene of Boosters, when Stanfield’s mysterious Prince-dude, who’s been trying to go out with Corvette, takes a friend of the gang back to his home.
—Jada Yuan, Vulture, 13 Mar. 2026
Wyteria Jones’ life is as mysterious as her 1982 disappearance.
—Gloria Casas, Chicago Tribune, 13 Mar. 2026
Another new Season 7 recurring cast addition, Cody Kearsley (Clay), will again recur next season as Jack’s mysterious new ranch hand continues to search for his missing sister.
—Nellie Andreeva, Deadline, 12 Mar. 2026
But then a mysterious Romany woman (Rebecca Ferguson) turns up, and persuades him to return to Birmingham, in order to bring his violent illegitimate son (Barry Keoghan) – who now runs his Peaky Blinders mob – to heel.
—The Week Uk, TheWeek, 12 Mar. 2026
See All Example Sentences for mysterious
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Jada Yuan, Vulture, 13 Mar. 2026
Wyteria Jones’ life is as mysterious as her 1982 disappearance.
—Gloria Casas, Chicago Tribune, 13 Mar. 2026
Another new Season 7 recurring cast addition, Cody Kearsley (Clay), will again recur next season as Jack’s mysterious new ranch hand continues to search for his missing sister.
—Nellie Andreeva, Deadline, 12 Mar. 2026
But then a mysterious Romany woman (Rebecca Ferguson) turns up, and persuades him to return to Birmingham, in order to bring his violent illegitimate son (Barry Keoghan) – who now runs his Peaky Blinders mob – to heel.
—The Week Uk, TheWeek, 12 Mar. 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 14 Mar. 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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