waver

To waver means to move back and forth or from side to side, often due to instability or uncertainty. It can describe physical movement, like a tree branch swaying in the breeze: "The tall grass wavered in the wind."

However, waver is most commonly used figuratively to express hesitation, doubt, or change in someone's beliefs, feelings, or actions. If someone says, "His determination began to waver," it means he started to lose confidence or resolve. A witness might waver in their testimony if they are unsure about what they saw.

The word suggests a lack of firmness or stability—a back-and-forth movement between different options without committing to one. You might say, "She wavered before accepting the job offer," meaning she was uncertain and considered both sides before making her decision. A leader who wavers in times of crisis is seen as weak, while someone with unwavering conviction stands firm.

Historically, "waver" comes from an Old English word related to trembling or shaking. This sense of instability remains at the heart of its meaning today—whether describing a physical movement or a mental state.

So, if something (or someone!) is unsteady, fluctuating, or hesitant, it's likely to waver.