Source : Webster's Revised Unabridged Dictionary (1913)

Stagnant \Stag"nant\, a. [L. stagnans, -antis, p. pr. of
   stagnare. See {Stagnate}.]
   1. That stagnates; not flowing; not running in a current or
      steam; motionless; hence, impure or foul from want of
      motion; as, a stagnant lake or pond; stagnant blood in the
      veins.

   2. Not active or brisk; dull; as, business in stagnant.

            That gloomy slumber of the stagnant soul. --Johnson.

            For him a stagnant life was not worth living.
                                                  --Palfrey.

Source : WordNet®

stagnant
     adj 1: not circulating or flowing; "dead air"; "dead water";
            "stagnant water" [syn: {dead(a)}]
     2: not growing or changing; without force or vitality [syn: {moribund}]