vacillate

To vacillate means to waver between different opinions, choices, or actions, usually because of doubt, uncertainty, or weak resolve. It suggests more than simple hesitation. There is a repeated back-and-forth movement, as if the person cannot stay with one decision for long. If someone vacillates for weeks about accepting a job, they keep leaning one way and then the other instead of deciding.

The word is often used for people, especially when they seem torn between two sides. A leader may vacillate during a crisis, changing direction and making others lose confidence. A friend may vacillate between moving abroad and staying close to family. In stories, a character may vacillate between love and duty, fear and courage, or hope and doubt.

The tone of the word is often mildly negative because it can suggest indecision, lack of firmness, or an inability to act. Still, it does not always describe weakness; sometimes it simply shows real inner conflict. The core idea is that the mind does not stay still.

The word comes from the Latin "vacillare," meaning "to sway" or "totter." That image of swaying helps explain the meaning well: to vacillate is to move back and forth mentally or emotionally without reaching a clear, steady position.