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Use "labourious" in a sentence
"The most labourious task of my day will be reheating the Thai leftovers for lunch."
"The router was immediately recognized so it was simply a case of entering the WPA encryption key (a labourious task since in my security conscious mode I had chosen a random 63 alphanumberic string … now, where did I keep that scrap of paper with it on ..) and it was off."
"However, Nathan Sutter, a geneticist specialising in dogs at Cornell University in Ithaca, New York, says “transgenesis is labourious, expensive and slow”."