adj Inflexible; liable to break, snap, or shatter easily under stress, pressure, or impact.
adj Not physically tough or tenacious; apt to break or crumble when bending.
adj (archaeology) Said of rocks and minerals with a conchoidal fracture; capable of being knapped or flaked.
adj Emotionally fragile, easily offended.
adj (engineering, computing, of a system) Poorly error- or fault-tolerant; having little in the way of redundancy or defense in depth; susceptible to catastrophic failure in the event of a relatively-minor malfunction or deviance.
adj (informal, proscribed) Diabetes that is characterized by dramatic swings in blood sugar level.
n A confection of caramelized sugar and nuts.
n (by extension) Anything resembling this confection, such as flapjack, a cereal bar, etc.
v (intransitive) To become brittle.
v (transitive, obsolete) To gut.
n A surname.