Dumb (5)

'dumb' is the definition.
(synonyms)
This is all the clue.
(Other definitions for mute that I've seen before include "Speechless, soundless" , "Unspeaking" , "Device that softens the tone of a musical instrument" , "having no voice" , "Silencer" .)
'dumb' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for inane that I've seen before include "Silly, witless" , "Unintelligent" , "Lacking sense, silly" , "Mindlessly silly" , "Delirious" .)