Use 'bromide' to describe dull, obvious advice that lacks depth. His speech was full of bromides that bored the audience.
Pro Tip 2/3
Avoid in Novels
'Bromide' implies the author uses unoriginal expressions. Good for critiques. The novel was criticized for its use of bromides instead of fresh dialogue.
Pro Tip 3/3
Conversational Caution
Don't use 'bromide' in everyday conversation; it can seem pretentious or insulting. Calling someone's advice a bromide might offend them.