- onerous⇄adv. onerously.
- onerous⇄noun onerousness.
- onerous⇄onerous, adjective.
1. hard to take or carry; burdensome; oppressive; troublesome.
Ex. Overtime work is well paid, but it is often onerous.
(SYN) heavy, weighty, arduous.
2. (Law.) of the nature of a legal burden or obligation.