a trite or obvious remark
"His advice was just a commonplace remark about hard work and no surprises."
A platitude or cliché.
"His speech was filled with so many commonplace phrases that no one remembered a single unique point he made."
To make a commonplace book.
"She decided to start a commonplace book by clipping interesting articles from her favorite magazine every weekend."
completely ordinary and unremarkable
"air travel has now become commonplace"
"commonplace everyday activities"
not challenging; dull and lacking excitement
"an unglamorous job greasing engines"
repeated too often; overfamiliar through overuse
"bromidic sermons"
"his remarks were trite and commonplace"
"hackneyed phrases"
"a stock answer"
"repeating threadbare jokes"
"parroting some timeworn axiom"
"the trite metaphor `hard as nails'"
Ordinary; not having any remarkable characteristics.
"After years of traveling, he found that nothing was truly commonplace anymore since every street corner held a new surprise."