dead as a doornail

Translations
мертвый как дверной гвоздь
After the long hike, he was as dead as a doornail.
После долгого похода он был мертв как дверной гвоздь.
Definitions
A phrase used to describe something that is unquestionably dead or lifeless, often implying that it is beyond any possibility of revival.
Words
doornail

noun
гвоздь
dead

adjective
мертвый