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." You may have heard the saying "hope for the best but expect the worst." Well, it you get the worst, you know there is nothing more bad than that. If you are at your worst, you have never before felt or performed this poorly. Don't confuse worst with worse, which compares only two things. Your cold might be worse than your brother's but dad's is the worst of all.

Definitions of worst
  1. noun
    the least favorable outcome
    “the worst that could happen”
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    type of:
    final result, outcome, result, resultant, termination
    something that results
  2. noun
    the weakest effort or poorest achievement one is capable of
    “it was the worst he had ever done on a test”
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    the supreme effort one can make
    type of:
    attempt, effort, endeavor, endeavour, try
    earnest and conscientious activity intended to do or accomplish something
  3. noun
    the greatest damage or wickedness of which one is capable
    “the invaders did their worst
    “so pure of heart that his worst is another man's best”
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    type of:
    evil, evilness
    the quality of being morally wrong in principle or practice
  4. adjective
    (superlative of `bad') most wanting in quality or value or condition
    “the worst player on the team”
    “the worst weather of the year”
    the lowest rank
    last, last-place, lowest
    lowest in rank or importance
    pessimal, pessimum
    of an organism's environment; least favorable for survival
    having undesirable or negative qualities
    of low or inferior quality
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    (superlative of `good') having the most positive qualities
    champion, prizewinning
    holding first place in a contest
    high-grade, top-grade, top-quality
    surpassing in quality
    first, foremost, world-class
    ranking above all others
    Sunday-go-to-meeting, go-to-meeting
    used of clothing
    optimal, optimum
    most desirable possible under a restriction expressed or implied
    the best of its kind
    surpassing any previously established record
    next to the best
    (used especially of merchandise) very fine in quality
    unexceeded, unexcelled, unsurpassed
    not capable of being improved on
    not to be exceeded
    incomparable, uncomparable
    such that comparison is impossible; unsuitable for comparison or lacking features that can be compared
    having desirable or positive qualities especially those suitable for a thing specified
    of high or superior quality or performance
    situated at the top or highest position
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  5. verb
    defeat thoroughly
    synonyms: mop up, pip, rack up, whip
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    type of:
    beat, beat out, crush, shell, trounce, vanquish
    come out better in a competition, race, or conflict
  6. adverb
    to the highest degree of inferiority or badness
    “She suffered worst of all”
    “schools were the worst hit by government spending cuts”
    “the worst dressed person present”
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