"an empty slogan" is correct and usable in written English.
You can use it to refer to an expression that is or appears to be meaningful but lacks any real substance. For example, "The company's 'innovation' slogan was nothing more than an empty phrase designed to attract investors."
Yet Britain's freedom is an empty slogan.
This was not an empty slogan.
Too often that's an empty slogan.
But the phrase is more than an empty slogan; it means standing up for American manufacturers.
A choice between a record of reform and an empty slogan of reform.
" 'Change you can believe in,' after this health-care-bill debacle, has now become an empty slogan," he says.
Nothing came of the "big society", a largely empty slogan that quietly disappeared.
Some felt it would take an unexpected tragedy -- a "black swan event" -- to focus the otherwise distracted President Obama long enough to motivate Congress' swing votes and vote counters to pass a strong climate bill that is more than just a few empty slogans about green jobs buried beneath mountains of subsidies for so-called "clean coal".
A front-page Times story by Don Van Natta and John Broder reporting that a mere 739 contributors are responsible for two-thirds of the $137 million in soft-money contributions to the G.O.P. gave new, if unsavory, meaning to the heretofore empty slogan "prosperity with a purpose".
It's been a long time since the notion of jogo bonito was anything other than an empty marketing slogan.
Purposeful companies require a purposive ecology, without which firms are incapable of internally and externally making credible commitments to their mission purpose, thus rendering corporate purpose an empty marketing slogan in practice.
