Difference between 'Worth less' and 'Worthless?'

Why is there a difference between Worth less and Worthless? I feel like they should mean the same thing, but they don't ironically

You are confusing the word less with the suffix -less.

The suffix means "without":

• A childless couple is one without children.
• A colorless, odorless, tasteless liquid has no color, odor, or taste.
• A worthless object has no value or worth.

Less is usually used as an adjective or adverb and is the comparative of little (little, less, least):

• Six is less than three.
• Rayon costs less than silk.
• A house in the suburbs is usually worth less than one in the city.