[peynz-tey-king, peyn-stey-]
taking or characterized by taking, pains or trouble; expending or showing diligent care and effort; careful: a painstaking craftsman; painstaking research.
careful and diligent effort.

1550–60; pain + -s3 + taking

painstakingly, adverb
painstakingness, noun

1. thorough, scrupulous. Painstaking careful meticulous conscientious all describe persons or behavior demonstrating attention to detail and effective task performance. painstaking stresses diligent and assiduous attention to detail in achieving a desired objective: a painstaking technician; the painstaking editing of a manuscript. Careful , the most general in sense of these words, implies serious intent to perform well and accurately whatever task one has in hand: a careful housepainter; a careful study of the social structure of gangs. Meticulous suggests extreme attention to details, especially the most minute, coupled with an almost obsessive desire to avoid error: a meticulous silversmith, every detail finished to perfection; fussily meticulous about matching shoes and clothing. Conscientious stresses scrupulous effort to obey one's sense of moral obligation to perform tasks well: a conscientious public defender; a conscientious description of the robbery. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
painstaking (ˈpeɪnzˌteɪkɪŋ)
extremely careful, esp as to fine detail: painstaking research

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1550s, paynes taking; see pain (n.) + take (v.). Related: Painstakingly.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
We debate and negotiate the final language with painstaking care, especially
  the list of desired qualities and experience.
These things take years of painstaking work for dialectologists.
After two decades of painstaking effort, now he'd be scooped.
Painstaking research-especially of plant remains found with the
  body-contradicts many of the initial speculations.
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