dim vs weaken

dim is an adjective but weaken is not an adjective.

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

As verbs, weaken is a hypernym of dim; that is, weaken is a word with a broader meaning than dim:

dim (adjective)	weaken (adjective)
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)	weaken (verb)
make dim or lusterless	become weaker
become dim or lusterless	lessen the strength of
make dim by comparison or conceal	reduce the level or intensity or size or scope of
become vague or indistinct	lessen in force or effect
switch (a car's headlights) from a higher to a lower beam	destroy property or hinder normal operations