Dead tired and Worn out

Worn out and dead tired are semantically related. in exhausted topic. In some cases you can use "Worn out" instead an adjective phrase "Dead tired", when it comes to topics like tired, extremely tired.

Worn out adjective - Drained of energy or effectiveness; extremely tired; completely exhausted.

Dead tired and worn out are semantically related. You can use "Dead tired" instead an adjective phrase "Worn out".