"dimmer" in the noun sense
a rheostat that varies the current through an electric light in order to control the level of illumination
"dimmer" in the adjective sense
1. dim, subdued
lacking in light not bright or harsh
"a dim light beside the bed"
"subdued lights and soft music"
2. dim, faint, shadowy, vague, wispy
lacking clarity or distinctness
"a dim figure in the distance"
"only a faint recollection"
"shadowy figures in the gloom"
"saw a vague outline of a building through the fog"
"a few wispy memories of childhood"
3. dimmed, dim
made dim or less bright
"the dimmed houselights brought a hush of anticipation"
"we like dimmed lights when we have dinner"
4. black, bleak, dim
offering little or no hope
"the future looked black"
"prospects were bleak"
"Life in the Aran Islands has always been bleak and difficult"- J.M.Synge
"took a dim view of things"
5. dense, dim, dull, dumb, obtuse, slow
slow to learn or understand lacking intellectual acuity
"so dense he never understands anything I say to him"
"never met anyone quite so dim"
"although dull at classical learning, at mathematics he was uncommonly quick"- Thackeray
"dumb officials make some really dumb decisions"
"he was either normally stupid or being deliberately obtuse"
"worked with the slow students"
Source: WordNet® (An amazing lexical database of English)
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