Lacking in originality; trite and commonplace. Bromidic remarks are so predictable and overused that they provide no insight or interest.
From 'bromide,' originally a sedative drug that made people dull and sleepy. In the early 1900s, 'bromide' came to mean a boring, conventional person, and then extended to boring, conventional statements. Bromidic things put you to sleep mentally, just like the drug did physically.
Bromide was literally a sleeping pill - it made people drowsy and dull. Bromidic statements have the same effect on your brain: they're so boring and predictable that they make your mind go to sleep. They're mental sedatives disguised as conversation.
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