frump

Example:She grumbled when she saw the bill, saying it was too high.

Definition:To make low complaining sounds or to express dissatisfaction in a low muttering voice.

Example:She often complains about the lack of internet speed in her apartment.

Definition:To express serious dissatisfaction or displeasure, especially in a persistent way.

Example:The committee members dissent from the proposal to cut the budget.

Definition:To show disagreement to something, often by word or act; to oppose.