adj. Inflexible, liable to break or snap easily under stress or pressure.adj. Not physically tough or tenacious; apt to break or crumble when bending.adj. Said of rocks and minerals with a conchoidal fracture; capable of being knapped or flaked.adj. Emotionally fragile, easily offended.n. A confection of caramelized sugar and nuts.n. Anything resembling this confection, such as flapjack, a cereal bar, etc.