All 4 Uses

brazen
in
The Two Towers
(Auto-generated)

Brazen trumpets sounded.†
Chpt 3.7 *
Then suddenly the cry of brazen-throated trumpets was heard: from the watch-towers they blared, and far away from hidden holds and outposts in the hills came answering calls; and further still, remote but deep and ominous, there echoed in the hollow land beyond the mighty horns and drums of Barad-dur.†
Chpt 4.3
His scarlet robes were tattered, his corslet of overlapping brazen plates was rent and hewn, his black plaits of hair braided with gold were drenched with blood.†
Chpt 4.4
Sam hurled himself against the bolted brazen plates and fell senseless to the ground.†
Chpt 4.10

Definitions:

(1) (brazen)
bold and unrestrained by what others consider proper
(2) (meaning too rare to warrant focus)
Less commonly, brazen can reference something made of or resembling brass (as in color or hardness). It can also reference an especially loud or harsh sound.