# mysterious

> English word · Adjective · IPA /mɪˈstɪə̯.ɹi.əs/ · frequency rank #5,440

## Definitions
1. Of unknown origin.
2. Having unknown qualities.
3. Difficult to understand.
4. Deliberately evasive or enigmatic.

## Etymology
From Middle English *misterius (implied in misteriusly), probably partly from Middle French mystérieux and partly from Latin mystērium + -ous. By surface analysis, mystery + -ous.

## Easily confused with
- **mysteriously** (https://plainspell.com/en/vs/mysterious-vs-mysteriously)
- **mysteries** (https://plainspell.com/en/vs/mysteries-vs-mysterious)

## Common misspellings (15)
`mmysterious`, `msyterious`, `mysetrious`, `myssterious`, `mysteirous`, `mysteriosu`, `mysteriouss`, `mysteriuos`, `mysteroius`, `mysterrious`, `mystreious`, `mystterious`, `mytserious`, `myysterious`, `ymsterious`

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/mysterious