slumbrous

Adjective slumbrous has 2 senses

• slumbrous(s = adj.all) slumberous - quiet and tranquil; "a slumberous June morning"
Derived form noun slumber₂

• slumbrous(s = adj.all) slumberous, slumbery, somnolent - inclined to or marked by drowsiness; "slumberous (or slumbrous) eyes"; "`slumbery' is archaic"; "the sound had a somnolent effect"