The term "pendulumlike" describes something that swings back and forth in a regular pattern, much like a pendulum. Other words or phrases that mean the same thing as pendulumlike include oscillating, swaying, swinging, and rocking. These words can describe motions that are either literal or figurative. A person's mood, for example, can be described as pendulumlike if they shift back and forth between extremes, such as happiness and sadness. In nature, the movement of trees in the wind or the waves of the ocean can also be described using these synonyms. These words help to paint a vivid picture of movement and change in various contexts.