damn

Something of little value.

“his promise is not worth a damn”

Wish harm upon; invoke evil upon.

Extremely.

Expletives used informally as intensifiers.

“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”

Used as expletives.

“oh, damn (or goddamn)!”