Definition of painstaking adjective from the Oxford Advanced American Dictionary

     

    painstaking

     adjective
    adjective
    NAmE//ˈpeɪnˌsteɪkɪŋ//
     
    [usually before noun]
     
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  1. 1needing a lot of care, effort, and attention to detail synonym thorough
  2. 2 painstaking research The event had been planned with painstaking attention to detail.
painstakingly
 
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adverb The building has been painstakingly restored to all its former elegance.
See the Oxford Advanced Learner's Dictionary entry: painstaking