Nouns

(n)brittle, toffee, toffycaramelized sugar cooled in thin sheets

Adjectives

(s)brittle, brickle, bricklyhaving little elasticity; hence easily cracked or fractured or snapped“brittle bones”, “glass is brittle”, “`brickle' and `brickly' are dialectal”
(s)brittlelacking warmth and generosity of spirit“a brittle and calculating woman”
(s)brittle, unannealed(of metal or glass) not annealed and consequently easily cracked or fractured