This is the 7780th most frequent Polish word.
martwy
"Martwy" means "dead" in English.
Here, 'martwy' is used as an adjective to describe the physical state of the bird, indicating it is no longer alive.
Martwy ptak leżał na trawie.
A dead bird lay on the grass.
In this sentence, 'martwe', the adjective form of 'martwy', is used metaphorically to describe the lack of activity or liveliness in the place.
To miejsce wydaje się martwe bez ludzi.
This place feels dead without people.
Here, 'martwe' is used to describe the state of the batteries, indicating they are no longer functioning or providing power, which is a figurative extension of the word's literal meaning.