inclined to or marked by drowsiness; "slumberous (or
slumbrous) eyes"; "`slumbery' is archaic"; "the sound had a somnolent effect" Synonym(s):slumberous, slumbery, slumbrous, somnolent
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
Slumbery \Slum"ber*y\, a.
Sleepy. [Obs.] --Chaucer.