After confessing to these things they had been pardoned, reinstated in the Party, and given posts which were in fact sinecures but which sounded important.
He even had a job, a sinecure, more highly-paid than his old job had been.
There are no more uses of "sinecure" in the book.
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He does have a job in the company library, an undemanding sinecure where he can do a lot of reading without bothering anyone, and occasionally he does a little research for one of the legitimate biologists on the staff.