Source : Webster's Revised Unabridged Dictionary (1913)

Slumbery \Slum"ber*y\, a.
   Sleepy. [Obs.] --Chaucer.

Source : WordNet®

slumbery
     adj : inclined to or marked by drowsiness; "slumberous (or
           slumbrous) eyes"; "`slumbery' is archaic"; "the sound
           had a a somnolent effect" [syn: {slumberous}, {slumbrous},
            {somnolent}]