dead to the world

adjective

1. idiomatic, not comparable Sound asleep. However, he slept right through the night, and was still dead to the world when I slipped out.
2. idiomatic, not comparable Unconscious. Simon hit him from behind on the back of his head. The size of his punch was enough to knock even the toughest senseless. Simon's victim fell to the deck. . . . There he lay, dead to the world.
3. idiomatic, not comparable Without social relationships or communication; without emotional or tangible bonds to others. [D]id you think that a being so sequestered as I am was already dead to the world, even while he was walking upon its surface?