Definitions from Wiktionary ( )

▸ adjective:  Inflexible; liable to break, snap, or shatter easily under stress, pressure, or impact.
▸ adjective:  Not physically tough or tenacious; apt to break or crumble when bending.
▸ adjective:  (archaeology) Said of rocks and minerals with a conchoidal fracture; capable of being knapped or flaked.
▸ adjective:  Emotionally fragile, easily offended.
▸ adjective:  (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.
▸ adjective:  (informal, proscribed) Diabetes that is characterized by dramatic swings in blood sugar level.
▸ noun:  A confection of caramelized sugar and nuts.
▸ noun:  (by extension) Anything resembling this confection, such as flapjack, a cereal bar, etc.
▸ verb:  (intransitive) To become brittle.
▸ verb:  (transitive, obsolete) To gut.
▸ noun:  A surname.

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