The Collaborative International Dictionary of English v.0.48:

Dampy \Damp"y\, a.
   1. Somewhat damp. [Obs.] --Drayton.
      [1913 Webster]

   2. Dejected; gloomy; sorrowful. [Obs.] "Dispel dampy
      throughts." --Haywards.
      [1913 Webster]