crapshoot

[krap-shoot]
noun
1.
Informal. anything unpredictable, risky, or problematical; gamble.
verb (used without object), crapshot, crapshooting.
2.
to play craps.
3.
Informal. to take risks; gamble.

Origin:
1970–75; crap2 + shoot

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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WordNet
crapshoot

noun
1. a risky and uncertain venture; "getting admitted to the college of your choice has become a crapshoot" 
2. playing craps [syn: crap shooting
WordNet® 3.0, © 2006 by Princeton University.
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Example sentences
So, your last sentence appears the more likely scenario, and even that may be a
  crapshoot.
We cannot bet a majority of our resources on a crapshoot.
Regulatory approval is always a crapshoot, but pharmaceutical reruns have
  better odds than new compounds.
The actual level of aggression in such an encounter may well be a crapshoot.
Synonyms
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