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We use both in North America. "damn" as a verb (curse, reject, denounce) and "damned" as an adjective (hated, revolting).

In North America, 'damned [noun]' is a marked usage. 'That damn cat' is considerably more common—more common in writing, and moreso in speech.

I'll stick with my babe Lady Macbeth and use "damned", thanks for the input.

Right. I used both in the original copy. But elsewhere, damn is used as both.