goddamned vs goddamn

goddamned and goddamn both are adjectives.

Word	Noun	Adjective	Verb	Adverb
goddamned	No	Yes	No	Yes
goddamn	No	Yes	No	Yes

As adjectives, goddamned and goddamn are synonyms defined as:

Other synonyms of goddamned include blame, blamed, blasted, blessed, damn, damned, darned, deuced, goddam, infernal.

As adverbs, goddamned and goddamn are synonyms defined as:

goddamned and goddamn: expressing anger, despair, frustration, approval, or surprise

Other synonyms of goddamned include goddam.

goddamned (adjective)	goddamn (adjective)
expletives used informally as intensifiers	used as expletives
	expletives used informally as intensifiers

goddamned (adverb)	goddamn (adverb)
expressing anger, despair, frustration, approval, or surprise	expressing anger, despair, frustration, approval, or surprise