nonstarter

Từ điển Việt Anh Việt 4in1 - English Vietnamese 4 in 1 Dictionary

non‧start‧er /ˌnɒnˈstɑːtə $ ˌnɑːnˈstɑːrtər/ BrE AmE noun [countable usually singular]
informal an idea, a plan, or a person that has no chance of success:
In its present form the scheme is a non-starter.