A more thorough explanation:

Definition: Totally lacking worth; of no use or value.

Examples:

• That broken vase is now worthless.
• His promises are worthless if he doesn't follow through.
• The old computer is so outdated that it's now worthless.

The examples illustrate the definition of "worthless" by showing things that have no value or use. The broken vase, for example, cannot be used for its intended purpose and has no value as a decorative item. Similarly, promises that are not kept are worthless because they do not lead to any positive outcome. The old computer is worthless because it cannot perform the tasks that modern computers can, making it of no use to anyone.