If you say that someone is indecisive, you mean that they find it very difficult to make decisions.
He was criticized as a weak and indecisive leader.
他被批评是位既懦弱又优柔寡断的领导人。
An indecisive result in a contest or election is one that is not clear or definite.
The outcome of the battle was indecisive.
这场战役的结果胜负不明。