There are 17 meanings listed in OED's entry for the word worst, two of which are labelled obsolete. See ‘Meaning & use’ for definitions, usage, and quotation evidence.

Disability News Service: Secret DWP report reveals how multiple errors led to claims ‘spiralling out of control’… and claimant deaths

Secret DWP report reveals how multiple errors led to claims ‘spiralling out of control’… and claimant deaths

The meaning of WORST is most corrupt, bad, evil, or ill. How to use worst in a sentence.

WORST definition: 1. superlative of bad: of the lowest quality, or the most unpleasant, difficult, or severe: 2. the…. Learn more.

Under the most negative circumstances, estimation, or interpretation: At worst, the storm will make us postpone the trip.

Worst is used to form the superlative of compound adjectives beginning with `bad' and `badly.' For example, the superlative of `badly-affected' is `worst-affected.'

The superlative of bad, evil, or ill; bad in the highest degree, whether morally, physically, financially, or otherwise: as, the worst sinner; the worst disease; the worst evil that can befall a state or an individual.

The term "worst" is an adjective used to describe something that is of the lowest quality, degree, or standard among others in a particular category. It refers to the most unfavorable or undesirable condition, behavior, outcome, or characteristic that can be observed or experienced.

The adjective worst describes the thing that is the least good, like this awful pizza, the worst we've ever had in our lives. Worst means "the least favorable outcome."