Definition of worst adjective from the Oxford Advanced Learner's Dictionary

  

worst

 adjective
adjective
BrE BrE//wɜːst//
 
; NAmE NAmE//wɜːrst//
 
 
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  •  (superlative of bad) of the poorest quality or lowest standard; worse than any other person or thing of a similar kind It was by far the worst speech he had ever made. What's the worst thing that could happen? What she said confirmed my worst fears (= proved they were right).
  • Word Origin Old English wierresta, wyrresta (adjective), wierst, wyrst (adverb), of Germanic origin; related to worse.Idioms
    be your own worst enemy
     
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     to be the cause of your own problems Her indecisiveness makes her her own worst enemy.
     to lose a fight, competition, etc. or suffer more compared with others
    See the Oxford Advanced American Dictionary entry: worst