Not very well (3)
(Other definitions for off-colour that I've seen before include "Not well - looking pale" , "Ailing - blue" , "Informally unwell, looking pallid or somewhat indecent" , "Unwell or indelicate - a bit pale?" , "Not in the pink?" .)
(Other definitions for under the weather that I've seen before include "put umbrellas up here?" , "not so good" , "Out of sorts" , "Sickening" , "Depressed" .)
(Other definitions for ill that I've seen before include "trouble" , "Imperfectly; unwell" , "Seasick" , "In short, the state of Chicago" , "Badly diminished" .)