Being in the repose of slumber; sleepy; drowsy.

inclined to or marked by drowsiness; "slumberous (or slumbrous) eyes"; "`slumbery' is archaic"; "the sound had a a somnolent effect"

To be slumberous [from the Middle English word for "doze"] is to be tired in the sense of lethargic, torpid. Slumberousness is not the same thing as indolence. See: LASSITUDE, LETHARGIC, TIRED, TORPID.

Inviting slumber; soporiferous.

quiet and tranquil; "a slumberous June morning"