Definition of worst adverb from the Oxford Advanced American Dictionary

  

worst

 adverb
adverb
NAmE//wərst//
 
 
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 (superlative of badly) most badly or seriously He was voted the worst dressed celebrity. The manufacturing industry was worst affected by the fuel shortage. Worst of all, I lost the watch my father had given me.
See the Oxford Advanced Learner's Dictionary entry: worst