Is MYSTERIOUS a valid Scrabble word?

Yes. MYSTERIOUS is valid in Collins Scrabble Words 2024, the word list used for Scrabble in the UK.

What MYSTERIOUS means

• adjective - Of unknown origin.

Definitions come from Wiktionary via kaikki.org, shortened to fit, and are used under CC BY-SA 4.0.

Gramlet is a daily word game played with the same Collins list. Play today's board.