adjective dimmer dim′·mer, dimmest dim′·mest

1. not bright; somewhat dark
2. not clear or distinct in character; lacking definition, distinction, strength, etc.
3. without luster; dull
4. not clearly seen, heard, perceived, or understood; vague
5. not clearly seeing, hearing, understanding, etc.
6. not likely to turn out well dim prospects
7. Informal lacking intelligence; stupid

Etymology: ME < OE, akin to ON dimmr, dark < IE base *dhem-, to be dusty, misty > damp, Ger dunkel, dark

transitive verb dimmed, dimming dim′·ming

1. to make dim
2. to make seem dim, as by comparison
3. to turn (headlights) down by switching from high to low beam

intransitive verb

noun

1. Archaic dim light; dimness; dusk
2. headlights on a low-beam setting