brittle

Short definition from Wiktionary

Adjective

1. 1
   Inflexible; liable to break, snap, or shatter easily under stress, pressure, or impact; crackly.
2. 2
   Not physically tough or tenacious; apt to break or crumble when bending.
3. 3
   Tending to fracture in a conchoidal way; capable of being knapped or flaked.
4. 4
   Emotionally fragile, easily offended.
5. 5
   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.
6. 6
   Characterized by dramatic swings in blood sugar level.

Noun

1. 1
   A confection of caramelized sugar and nuts.
2. 2
   Anything resembling this confection, such as flapjack, a cereal bar, etc.

Verb

1. 1
   To become brittle.
2. 2
   To gut.

Proper noun

1. 1
   A surname.