Tāmen de hūnyīn míngcún-shíwáng, zhǐshì hái méi bàn líhūn shǒuxù.
Their marriage exists in name only; they just haven't filed for divorce yet.
Tips
history
From Han Yu's Tang-dynasty 《处州孔子庙碑》: '郡邑皆有孔子庙,或不能修事...名存实亡.' Han Yu laments that Confucius temples in many prefectures exist only in name because no one maintains them.
usage
Negative, describes institutions, treaties, rules, marriages, or titles that are hollow shells. Common subjects: 组织, 制度, 婚姻, 条约, 规定. Opposite: 名副其实 (name matches reality).