Is this sentence grammatically and naturally correct?
▪When he sits down with books, he forgets worldliness, immersing only in reading all the while.
Hi, Toaha—I strongly prefer Gustavo's revision of the sentence. The main grammatical issue is that "immersing" does not have a direct object, whereas, being a strongly transitive verb, "immerse" requires a direct object. Even the OED does not have a non-obsolete intransitive listing for "immerse."
In Gustavo's revision, "immersed" is an adjective and so does not take an object. You could say either "When he sits down with books, he becomes so immersed in them that . . ." (adjective) or "When he sits down with books, he immerses himself so much in them that . . . ." (verb with a reflexive direct object).
The use of "worldliness" is not natural or precise. "Worldliness" is the noun related to the adjective "worldly." Someone intently reading a book does not forget about the quality of pertaining to or being devoted to the world, though he might very well forget about the world's problems. Another possible revision:
When he sits down with books, he immerses himself so much in them that he forgets about the world's problems.
Finally, since it is understood that the forgetting coincides with the reading, it is unnecessary and unnatural to add "all the while" at the end.
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