Generally not comparable; used attributively to describe something ineffective or worthless.
Translations
The movie was a dud and didn't impress the audience.
Фильм был неудачным и не произвел впечатления на зрителей.
Definitions
Ineffective, worthless, or counterfeit; not functioning or genuinely what it purports to be. We threw away the dud batteries after they failed to power the flashlight.