Source : Webster's Revised Unabridged Dictionary (1913)

Depress \De*press"\, v. t. [imp. & p. p. {Depressed}; p. pr. &
   vb. n. {Depressing}.] [L. depressus, p. p. of deprimere; de-
   + premere to press. See {Press}.]
   1. To press down; to cause to sink; to let fall; to lower;
      as, to depress the muzzle of a gun; to depress the eyes.
      ``With lips depressed.'' --Tennyson.

   2. To bring down or humble; to abase, as pride.

   3. To cast a gloom upon; to sadden; as, his spirits were
      depressed.

   4. To lessen the activity of; to make dull; embarrass, as
      trade, commerce, etc.

   5. To lessen in price; to cause to decline in value; to
      cheapen; to depreciate.

   6. (Math.) To reduce (an equation) in a lower degree.

   {To depress the pole} (Naut.), to cause the sidereal pole to
      appear lower or nearer the horizon, as by sailing toward
      the equator.

   Syn: To sink; lower; abase; cast down; deject; humble;
        degrade; dispirit; discourage.

Source : WordNet®

depressing
     adj 1: causing dejection; "a blue day"; "the dark days of the war";
            "a week of rainy depressing weather"; "a disconsolate
            winter landscape"; "the first dismal dispiriting days
            of November"; "a dark gloomy day"; "grim rainy
            weather" [syn: {blue}, {dark}, {disconsolate}, {dismal},
             {dispiriting}, {gloomy}, {grim}]
     2: causing or suggestive of sorrow or gloom; "a gloomy
        outlook"; "gloomy news" [syn: {depressive}, {gloomy}, {saddening}]