Hidebound things — or people — are stuck in the past, unable to change. Your grandmother's hidebound ideas about fashion mean she never leaves the house without a hat and matching purse.
Someone who's painfully old-fashioned, with chauvinistic, inflexible ideas and beliefs about the world can be described as hidebound. A hidebound culture can make a school, family, or workplace difficult and unpleasant for anyone who doesn't fit those narrow-minded standards. In the 16th century, the adjective originally described a condition of cattle, an unhealthy and emaciated state. Hidebound evolved from there, first describing painfully thin people, then those who are "narrow in outlook."