Adjective
dead tired (not comparable)
Very tired; completely exhausted.
dead-tired
I was born in London, and went to school in Scotland - I used to be dead tired when I got home at night. Norman Wisdom
The human body is an amazing organism. It can go from dead tired to completely alert in a terrified blink. Ilona Andrews
Every morning, when I'm really, really tired... when I'm dead tired is when I feel most alive. Logan Browning
I'll go sleep on the couch," James said. "No, you won't," Poppy said firmly. She flopped on the bed beside him. "You're dead tired. And I know I'm safe with you." James grinned without moving his arm. "Because I'm dead tired? L.J. Smith