1. dead to the world - Adjective
2. dead to the world - Phrase
Unconscious.
Sound asleep.
Without social relationships or communication; without emotional or tangible bonds to others.
Source: en.wiktionary.orgYoung women with ambitions should be very crafty and cautious, lest mayhap they be caught in the soft, silken mesh of a happy marriage, and go down to oblivion, dead to the world. Elbert Hubbard
He that hath lost his credit is dead to the world. George Herbert
He that has lost his credit is dead to the world. German Proverb
The year long " Dead to the World Tour " followed, which was the band's longest and widest-ranging tour yet. Source: Internet