is anyone's guess

something is anyone's guess

also something is anybody's guess

no one knows the answer How the lawsuit will turn out is anybody's guess. At that point, whether he was dead or alive was anyone's guess.

Name	Pronounced	Usage
Gentry	['dʒentri]
Abilene	AB-i-leen (English), ab-i-LEE-nee (English)	Biblical
Rosaire	ro-ZER	French
Turid	-	Swedish, Norwegian, Danish
Bower	['bauə]
Belinha	-	Portuguese