vacillator

n. 踌躇
犹豫
动摇

例句与用法：

Free from hesitation or vacillation; resolute.

坚定的毫不犹豫的或毫不迟疑的; 坚决的

Debate over an issue; vacillation.

对一个问题的争论; 游移

You are expected to answer the call with immediate actions and not with vacillation.

希望大家闻风而动，不要举棋不定。