IPA: /ləˈbɔːrɪəsli/
KK: /ˈleɪbərɪəsli/
In a way that requires a lot of effort and hard work.
She laboriously completed the project, spending many late nights working on it.
Laboriously → It is formed from "labor" (from Latin "labor", meaning work or toil) and the suffix "-iously" (meaning in a manner characterized by). The word "laboriously" means in a manner characterized by hard work or effort.
Think of 'labor' as work, and remember that 'laboriously' means doing something in a way that requires a lot of effort.