Definitions of brittle:

• noun:   caramelized sugar cooled in thin sheets
• adjective:   (of metal or glass) not annealed and consequently easily cracked or fractured
• adjective:   lacking warmth and generosity of spirit

  Example: "A brittle and calculating woman"

• adjective:   having little elasticity; hence easily cracked or fractured or snapped

  Example: "Brittle bones"

• name:  A surname (very rare: popularity rank in the U.S.: #27934)