plat ‧ i ‧ tude /ˈplætətjuːd, ˈplætɪtjuːd $ -tuːd/ BrE AmE noun [countable] formal
[ Date: 1800-1900 ; Language: French ; Origin: plat 'flat, dull' ]
a statement that has been made many times before and is not interesting or clever – used to show disapproval:
His excuse was the platitude ‘boys will be boys.’
—platitudinous /ˌplætəˈtjuːdənəs◂, ˌplætɪˈtjuːdənəs◂ $ -ˈtuː-/ adjective