Looking up...
in a state of deep sleep
The princess lay slumbering in the tower.
The princess was sleeping deeply in the tower.
The forest was slumbering under the moonlight.
The forest was quiet and still, as if in deep sleep.
Often used in literary or poetic contexts to describe a peaceful, deep sleep.
The word 'slumbering' can be used to describe things that are inactive but have potential, like 'a slumbering economy'.
While poetic, overusing 'slumbering' can make writing sound overly formal or archaic.
From Middle English 'slumberen' (to sleep), from Old English 'slumberian', of Germanic origin.
Often used metaphorically to describe something that is inactive or dormant but has potential.