GODDAMN
blasted, blame, blamed, blessed, damn, damned, darned, deuced, goddam, goddamn, goddamned, infernal
(adjective) expletives used informally as intensifiers; “he’s a blasted idiot”; “it’s a blamed shame”; “a blame cold winter”; “not a blessed dime”; “I’ll be damned (or blessed or darned or goddamned) if I’ll do any such thing”; “he’s a damn (or goddam or goddamned) fool”; “a deuced idiot”; “an infernal nuisance”
damn, goddamn
(adjective) used as expletives; “oh, damn (or goddamn)!”
goddam, goddamn, goddamned
(adverb) extremely; “you are goddamn right!”
Source: WordNet® 3.1
Etymology
Interjection
goddamn
(slang) An expression of anger, surprise, intense excitment or frustration.
Synonyms
• gods damn (polytheistic)
Adjective
goddamn (not comparable)
(pejorative) Damned by God.
(vulgar, offensive) Used as an intensifier.
Synonyms
• godsdamn (polytheistic)
• goddamned
• gorram, dadgum
Synonyms
• See also damned
Source: Wiktionary