Colorless
'colorless' is the definition.
(similar in meaning)
This is all the clue.
(Other definitions for wan that I've seen before include "Pale in Botswana" , "Pasty" , "Pale and looking ill" , "Pale and ill-looking" , "Pale and peaky" .)
'colorless' is the definition.
(similar in meaning)
This is the entire clue.
(Other definitions for drab that I've seen before include "Shabby; a slattern (arch.)" , "woman with slatternly habits" , "Rather dull" , "Dull and boring" , "Dingy - shabby" .)