Which word describes a heavy, laborious movement?

The word that describes a heavy, laborious movement is "plod." This term connotes a slow and heavy step, often used to evoke the image of someone moving with great effort, such as trudging through mud or snow. The associated imagery includes a sense of weariness or a burden, highlighting the laborious nature of the movement.

In contrast, the other terms do not convey the same meaning. "Pine" refers to a state of longing or yearning, not movement. "Pompous" describes someone who is self-important or arrogant, typically in behavior or speech, and does not relate to physical movement. "Prevalent" means widespread or common and does not imply any particular type of movement, heavy or otherwise. Thus, "plod" is distinctly aligned with the idea of a heavy, laborious movement.