Non-Starter
Noun · Slang & Abbreviations
Definitions
An idea or proposal so impractical or unacceptable that serious work on it cannot really begin. In engineering slang, calling something a non-starter is a blunt way to close a path quickly.
In plain English: An idea that is not workable enough to even begin seriously.
Example: "Requiring every customer to reissue tokens during the maintenance window was a non-starter, which forced the team to design a backward-compatible transition path instead."