"Outdated textbooks" refers to educational books or learning materials that are no longer up-to-date or relevant to the current information and knowledge in a particular field or subject. Full definition
The bookshelf where I kept my collection of young - adult novels holds nothing but a few outdated textbooks. (washingtonpost.com)
Despite efforts to require lessons on civil rights, outdated textbooks indicate little has changed. (apmreports.org)
Holes in her talent pool included smart digital designers and marketers, people with user - experience (UX) expertise, and skilled project managers who have actually worked on real - world challenges and not just performed outdated textbook exercises. (canadianbusiness.com)