Who more busy than they that have least to do.

The proverb observes a contrast between the amount of work someone has and how busy they appear. A light workload does not always bring an air of ease.

It can gently mock a person who makes a great commotion over small tasks, suggesting that visible activity is not a reliable measure of how much needs doing.

Use it to comment wryly when someone with few apparent responsibilities seems unusually occupied or makes a minor task look demanding. It is a judgment about appearances, not proof that the person is idle.