In senses of the verb: esp. Of a book or pamphlet: Fastened with stitches; in early use = sewed, adj.; in present use, fastened together by a…

Of books: Having the sheets stitched together, but not bound.

Of an unbound or paper-covered book: stitched.

That overcasts something (in various senses of the verb).

Of a book, pamphlet, etc.: bound using saddle stitches (saddle stitch, n. 1).