all-or-nothing
adj1
Being or relating to a situation where a dichotomy (a binary state) pertains: either of two poles is instantiated, with no intermediate state (e.g., a mixture or syncretism) being possible or being permitted.
- Near-synonyms: black-and-white, dichotomous, all-or-none
2
Being or relating to a project that will either succeed completely or fail completely.
- A crewed moonshot is an all-or-nothing affair: either they get to the moon and back alive, or they don't.