Sentence:  “Heavens!” exclaimed Nina, “the blue-stocking and the fogy!—and yours "are" pale blue, Eileen!—you're about as self-conscious as Drina—slumping there with your hair tumbling "à la" Mérode! Oh, it's very picturesque, of course, but a <WSD>straight</WSD> spine and good grooming is better.nb...” 
Meaning of the word marked with <WSD> tags:  Not crooked or bent; having a constant direction throughout its length. (from 14thc.)