Source : Webster's Revised Unabridged Dictionary (1913)

Depressive \De*press"ive\, a.
   Able or tending to depress or cast down. --
   {De*press"ive*ness}, n.

Source : WordNet®

depressive
     adj : causing or suggestive of sorrow or gloom; "a gloomy
           outlook"; "gloomy news" [syn: {depressing}, {gloomy}, {saddening}]

depressive
     n : someone suffering psychological depression