indecisive

形容词 indecisive:

1. characterized by lack of decision and firmness
2. not definitely settling something
3. not clearly defined

1. He's too indecisive to make a good leader.
   他优柔寡断，当不了好领导。

in.de.ci.sive

adj.（形容词）
Prone to or characterized by indecision; irresolute:
优柔寡断的, 不果断的：倾向于或以下不了决定为特征的；犹豫不决的：
例句：
an indecisive manager.
优柔寡断的经理

Inconclusive:
非决定性的：
例句：
an indecisive contest; an indecisive battle.
非决定性的竞赛；非决定性的战役

Not clearly defined; indefinite:
未明确定义的；模糊的：
例句：
indecisive boundaries running through mountainous terrain.
高山岩层上不明确的边界

【引伸】
in.deci.sively
adv.（副词）
in.deci.siveness
n.（名词）