dim vs dimmed

dim and dimmed both are adjectives.

Word	Noun	Adjective	Verb	Adverb
dim	No	Yes	Yes	No
dimmed	No	Yes	No	No

As adjectives, dim and dimmed are synonyms defined as:

dim (adjective)	dimmed (adjective)
made dim or less bright	made dim or less bright
lacking in light; not bright or harsh
offering little or no hope
lacking clarity or distinctness
slow to learn or understand; lacking intellectual acuity

dim (verb)	dimmed (verb)
make dim or lusterless
become dim or lusterless
make dim by comparison or conceal
become vague or indistinct
switch (a car's headlights) from a higher to a lower beam