'Slumbrous' definitions:

Definition of 'slumbrous'

(from WordNet)
adjective
Quiet and tranquil; "a slumberous June morning" [syn: slumberous, slumbrous]
adjective
Inclined to or marked by drowsiness; "slumberous (or slumbrous) eyes"; "`slumbery' is archaic"; "the sound had a somnolent effect" [syn: slumberous, slumbery, slumbrous, somnolent]

Definition of 'Slumbrous'

From: GCIDE
  • Slumbrous \Slum"brous\, a. Slumberous. --Keats. [1913 Webster]