laborious
luh-BOR-ee-usadjMeaning needing a lot of slow, careful work
Memory hook LABOR-ious: so much LABOR. Felix copies the whole thick book by hand with a feather pen, one slow letter at a time: the work is laborious.
Copying the old recipe book by hand was a laborious job.
In context Before computers, making a dictionary was laborious; editors wrote each definition on a paper slip and sorted millions of slips by hand.
Similar painstaking, toilsome, arduous, tedious
Opposite easy, effortless, quick
From Latin laboriosus, from labor (work, toil).