IPA: /ləˈbɔːriəsnəs/
KK: /ləbˈɔrɪəsnəs/
The state or quality of requiring a lot of effort and hard work.
The laboriousness of the project made it difficult to complete on time.
Laboriousness → It is formed from "labor" (from Latin "labor", meaning work or toil) and "-ious" (meaning full of) and "-ness" (meaning the state of). The word "laboriousness" refers to the state of being full of work or requiring much effort.
Think of 'labor' meaning work, and remember that 'laboriousness' describes the state of being full of hard work.