General
deadly
What does deadly mean?
Excellent or very good; a positive term widely used in Aboriginal English (as in the Deadly Awards).
"You got the job? Deadly, unna!"
Origin
An inversion of the standard meaning (dangerous/lethal) into a positive intensifier, common in Hiberno-English since at least the mid-20th century. Part of a wider slang pattern where 'bad' words mean 'great'.
Frequently asked questions
What does deadly mean in Irish slang?
It means excellent or brilliant — a positive word, the opposite of its standard 'lethal' meaning.
Is deadly a compliment in Ireland?
Absolutely. Calling something deadly means you think it's great, cool, or class.
How do you reply to good news with deadly?
Just say 'deadly!' on its own as an excited reaction, like saying 'brilliant!' or 'class!'
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