Sad (7)
(Other definitions for unhappy that I've seen before include "In low spirits" , "Dejected, not contented" , "Sad, distressed" , "Woeful" , "Infelicitous" .)
'sad' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for doleful that I've seen before include "Dreary" , "Sad" , "Causing grief; sorrowful" , "Dismal" , "Showing great melancholy" .)
(Other definitions for blue that I've seen before include "Varsity sportsman" , "Tory?" , "Colour - near the knuckle!" , "in Oxford, it's dark" , "entertaining rabbi" .)
'sad' is the definition.
(down can mean sad or unhappy)
This is all the clue.
(Other definitions for down that I've seen before include "Fluff - sorrowful" , "See 3" , "Sad; feathers" , "Fuzz" , "Soft feathers; direction" .)
'sad' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for pathetic that I've seen before include "Feeble; inspiring pity" , "Arousing pity or sadness" , "Arousing pity, miserably inadequate" , "Pitiable, inadequate" , "Hapless, miserable" .)
'sad' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for downcast that I've seen before include "blue" , "Dejected and discouraged" , "Feeling despondent" , "Low in spirits" , "Depressed - looking at the floor?" .)
'sad' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for mournful that I've seen before include "Expressing sadness" , "Doleful, plaintive" , "Gloomy" , "Feeling grief" , "Sad, regretful" .)
'sad' is the definition.
(associated in meaning)
This is all the clue.
(Other definitions for sorrowful that I've seen before include "Grief-stricken" , "Unhappy" , "Miserable" , "Sad, dejected" , "Melancholy" .)