With great attention to detail; complete, thorough.
He did a thoroughgoing job of cleaning up the broken glass.
1967, Time, "Marijuana is Still Illegal," 29 December, 1967, https://web.archive.org/web/20130721101358/http://www.time.com/time/magazine/article/0,9171,844332,00.html
After six months of preparation, Lawyer Joseph Oteri began in September the most thoroughgoing legal attack on antimarijuana laws ever made.
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