mysterious.
Of unknown origin.
Meaning & usage
Of unknown origin.
He received a mysterious phone call this morning.
Having unknown qualities.
Our boss is a mysterious man who hardly ever meets with us.
Difficult to understand.
Why he left without saying goodbye is quite mysterious.
Deliberately evasive or enigmatic.
Stop being mysterious and just tell me what you want.
Where this word comes from
From Middle English *misterius (implied in misteriusly), probably partly from Middle French mystérieux and partly from Latin mystērium + -ous. By surface analysis, mystery + -ous.
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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.
Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.