All 3 Uses

bromide
in
Atlas Shrugged
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That may be a bromide, boys, but that's how I feel.†
Chpt 2.2 *
The crowd knew from the newspapers that he represented the evil of ruthless wealth; and-as they praised the virtue of chastity, then ran to see any movie that displayed a half-naked female on its posters-so they came to see him; evil, at least, did not have the stale hopelessness of a bromide which none believed and none dared to challenge.†
Chpt 2.4
She thought suddenly of those modern college-infected parasites who assumed a sickening air of moral self-righteousness whenever they uttered the standard bromides about their concern for the welfare of others.†
Chpt 2.10

Definitions:

(1) (bromide as in: same old political bromides)
something said so many times before, it lacks significance
(2) (meaning too rare to warrant focus)