Read the dictionary definition of darned. All definitions for this word.
1. expletives used informally as intensifiers
1. he's a blasted idiot
2. it's a blamed shame
3. a blame cold winter
4. not a blessed dime
5. I'll be damned (or blessed or darned or goddamned) if I'll do any such thing
6. he's a damn (or goddam or goddamned) fool
7. a deuced idiot
8. an infernal nuisance