slumberous in British English
(ˈslʌmbərəs, -brəs) or slumbrous (ˈslʌmbrəs)
adjective mainly poetic3. characteristic of slumber
Derived forms
slumberously (ˈslumberously) or slumbrously (ˈslumbrously) adverb
slumberousness (ˈslumberousness) or slumbrousness (ˈslumbrousness) noun