untempered vs brittle

untempered is not a noun while brittle is a noun.

Word	Noun	Adjective	Verb	Adverb
untempered	No	Yes	No	No
brittle	Yes	Yes	No	No

untempered (noun)	brittle (noun)
	caramelized sugar cooled in thin sheets

untempered (adjective)	brittle (adjective)
not moderated or controlled	having little elasticity; hence easily cracked or fractured or snapped
not brought to a proper consistency or hardness	lacking warmth and generosity of spirit
	(of metal or glass) not annealed and consequently easily cracked or fractured