not allowing for qualification or compromise; either fully or not at all operative: an all-or-nothing approach.

1755–65 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To all-or-nothing
Example sentences
These can provide access to new products, technologies and markets, but without
  an all-or-nothing gamble.
All-or-nothing proposals are especially salient and likely to provoke a fight.
Tells something about the exhilaration of the all-or-nothing way of life of
  professional gamblers.
The traditional, binary, all-or-nothing approach to military missions is based
  on bitter experience.
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