Is DEADLY a valid Scrabble word?

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

What DEADLY means

• adjective - Subject to death; mortal.
• adverb - Fatally, mortally.

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

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