Definition of dumbs:
(adj) :
(informal, derogatory, especially of a person) Stupid.
(adj) :
(figuratively) Pointless, foolish, lacking intellectual content or value.
(adj) :
Lacking some functionality or property ordinarily characteristic of its kind.
(adj) :
(of technology) Not equipped with intelligent behavior or processing capabilities of its own.
(adj) :
(dated) Unable to speak; lacking power of speech.
(adj) :
(dated, of things, actions, etc.) Unaccompanied by words or speech, silent, wordless.