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

  

worst

 adverb
adverb
BrE BrE//wɜːst//
 
; NAmE NAmE//wɜːrst//
 
 
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 (superlative of badly) most badly or seriously He was voted the worst dressed celebrity. Manufacturing industry was worst affected by the fuel shortage. Worst of all, I lost the watch my father had given me. Word Origin Old English wierresta, wyrresta (adjective), wierst, wyrst (adverb), of Germanic origin; related to worse.
See the Oxford Advanced American Dictionary entry: worst