painstakingly

From painstaking +‎ -ly.

• IPA^(key): /ˈpeɪnˌsteɪkɪŋli/

painstakingly (comparative more painstakingly, superlative most painstakingly)

1. In a painstaking manner; very slowly and carefully.
   • 1909, Mark Twain [pseudonym; Samuel Langhorne Clemens], “Is Shakespeare Dead?”, in What Is Man? And Other Essays, New York, N.Y.; London: Harper & Brothers, published May 1917, page 314:

     I wish he had had a dog, just so we could see how painstakingly he would have divided that dog among the family, in his careful business way.