1. The state of being poorly illuminated
   "The dimness of the hallway made it hard to see";
   - duskiness
    
2. The property of lights or sounds that lack brilliance or are reduced in intensity
   "The dimness of the candle created a romantic atmosphere";
   - subduedness
    
3. The quality of being dim or lacking contrast
   "The dimness of the old lightbulb made reading difficult";
   - faintness

Type of: blurriness, dullness, fogginess, fuzziness, indistinctness, semidarkness, softness

Encyclopedia: Dimness