Not bright (4)
'not bright' is the definition.
(I know that dull is the opposite attribute of bright)
This is all the clue.
(Other definitions for dull that I've seen before include "Lacklustre" , "Overcast or uninteresting" , "Lacking in liveliness or animation" , "Uninspiring" , "Dreary" .)
'not bright' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for dim that I've seen before include "Vague" , "Opaque, not bright" , "Darken" , "Sombre" , "Slow-witted" .)
(Other definitions for muted that I've seen before include "Muffled, subdued" , "Quietened" , "Kept quiet" , "with reduced volume" , "(Of sound/colour) softened" .)