プログレッシブ和英中辞典(第4版)の解説
よだん【予断】
(a) prediction ((that))
予断する predict ((that))
次に何が起こるか予断できない
No one can predict [There is no knowing] what will happen next.
成功するかどうかは予断を許さない
We can't make any guesses [predictions] as to its success./There's no telling whether it will succeed or not.
それについては楽観的な予断は許されない
We mustn't allow ourselves to be (overly) optimistic about it.