"slumberous" in the adjective sense
1. slumberous, slumbrous
quiet and tranquil
"a slumberous June morning"
2. slumberous, slumbery, slumbrous, somnolent
inclined to or marked by drowsiness
"slumberous (or slumbrous) eyes"
"`slumbery' is archaic"
"the sound had a somnolent effect"
Source: WordNet® (An amazing lexical database of English)
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