la·bo·ri·ous 
/ləˈborijəs/ adjective
/ləˈborijəs/ adjective [more laborious; most laborious] : requiring a lot of time and effort
▪ Removing mildew stains is a laborious [=difficult, painstaking] task. ▪ a slow and laborious process/procedure
▪ Removing mildew stains is a laborious [=difficult, painstaking] task. ▪ a slow and laborious process/procedure
— la·bo·ri·ous·ly adverb
▪ They spent many hours laboriously polishing the silverware.
▪ They spent many hours laboriously polishing the silverware.
— la·bo·ri·ous·ness noun [noncount]
