Worse and worst are often misused in the English language. Here is a simple definition describing when to use them correctly.
Worse: Use worse to compare two things. Think of it like better only in the negative instead of the positive.
Example: My husband’s singing is worse than mine.
Worst: Use worst when one thing is inferior to something else. Think of worst like best, only in the negative.
Example: My husband has the worst singing voice in the world.
***Note: My husband really doesn’t have the worst voice, he just has the worst time remembering the correct lyrics to songs, which is worse.