
Be lost to the world
Mental Immersion
Used when someone is completely focused and oblivious to surroundings.

During the chess tournament, she was lost to the world.
Not Distractible
Implies it's hard to interrupt or pull the person's attention away.

With headphones on, he's lost to the world.
Creative Absorption
Often used for artists or people engaged in creative pursuits.

Lost to the world, the novelist spent hours on her new book.
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