DIMMER

adjective

1. Not bright or colorful.
2. Not smart or intelligent.
3. Indistinct, hazy or unclear.

adjective

1. Lessened, reduced
2. Made to seem less important, impressive, or valuable
3. Reduced by a semitone

noun

1. A rheostat that is used to vary the intensity of a domestic electric light
2. A switch used to select between the low and high headlamp beam on a road vehicle. (usually as "dimmer switch", primarily in North America; elsewhere "dipswitch" or "dipper switch")