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Definition of painstaking adjective from the Oxford Advanced American Dictionary

 

painstaking

 adjective
adjective
NAmE//ˈpeɪnˌsteɪkɪŋ//
 
[usually before noun]
 
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needing a lot of care, effort, and attention to detail synonym thorough 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 painstaking in the Oxford Advanced Learner's Dictionary