Definition of thoroughly adverb from the Oxford Advanced American Dictionary

      

    thoroughly

     adverb
    adverb
    NAmE//ˈθərəli//
     
    , NAmE//ˈθəroʊli//
     
     
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  1. 1very much; completely We thoroughly enjoyed ourselves. I'm thoroughly confused. a thoroughly professional performance I can thoroughly recommend it.
  2. 2completely and with great attention to detail Wash the fruit thoroughly before use. The work had not been done very thoroughly.
See the Oxford Advanced Learner's Dictionary entry: thoroughly