IPA: /ˈoʊnərəsli/
KK: /ˈoʊnərəsli/
In a way that is burdensome or difficult to bear.
The project was completed onerously, requiring many late nights and extra effort from the team.
Onerously → It is formed from "onerous" (from Latin "onerosus", meaning burdensome or heavy) and the suffix "-ly" (meaning in a manner of). The word "onerously" means in a burdensome or heavy manner.
Think of something that is 'burdensome' ('onerous') and how it is done 'in a manner of' ('-ly'). This helps you remember that 'onerously' describes doing something in a heavy or burdensome way.