Bromidic is an adjective that means commonplace or trite.
The chemical bromide’s etymology is of unknown origin, but we do know that bromide is a sedative used medicinally. When used metaphorically, something bromidic may not actually put you to sleep, but it may bore you — as trite, cliche things often do.
Our coach loved to deliver these bromidic speeches consisting of tedious cliches. Far from inspiring us, those speeches just bored us.