- slumberous, slumbrous - quiet and tranquil; "a slumberous June morning"
Antonym: unquiet (indirect, via quiet)
- slumberous, slumbery, slumbrous, somnolent - inclined to or marked by drowsiness; "slumberous (or slumbrous) eyes"; "`slumbery' is archaic"; "the sound had a a somnolent effect"
Antonym: awake (indirect, via asleep)