goddamned vs goddam

goddamned and goddam both are adjectives.

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

As adjectives, goddamned and goddam are synonyms defined as:

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

As adverbs, goddamned and goddam are synonyms defined as:

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

Other synonyms of goddamned include goddamn.

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

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