Main Entry: slum·ber·ous

Variant(s): or slum·brous \ˈsləm-b(ə-)rəs\

Function: adjective

Date: 15th century

1 : heavy with sleep : sleepy
2 : inducing slumber : soporific
3 : marked by or suggestive of a state of sleep or lethargy <a slumberous state of peace>