The decrease in size, from Ralph down, was gradual; and though there was a dubious region inhabited by Simon and Robert and Maurice, nevertheless no one had any difficulty in recognizing biguns at one end and littluns at the other.
There are no more uses of "dubious" in the book.
Show samples from other sources
She was dubious, but agreed to come with us anyway.
She has a dubious reputation. I wouldn’t count on her.