We don't have any synonyms for dimmest yet.
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Definition of dimmest:
(adj) :
Not bright or colorful.
(adj) :
Indistinct, hazy or unclear.
(v) :
(transitive) To make something less bright.
(v) :
To render dim, obscure, or dark; to make less bright or distinct.
(v) :
(intransitive) To become darker.
(adj) :
(colloquial) Not smart or intelligent.