The definition of onerous is something hard to do, or troublesome.
An example of onerous is telling someone you betrayed them.
- burdensome; laborious
- Law involving a legal obligation that equals or exceeds the benefits: onerous lease
Origin of onerousMiddle English from Middle French onereus from Classical Latin onerosus from onus, a load: see onus
- Troublesome or oppressive; burdensome. See Synonyms at burdensome.
- Law Entailing more liabilities than benefits or imposing significant obligations.
Origin of onerousMiddle English from Old French onereus from Latin onerōsus from onus oner- burden
(comparative more onerous, superlative most onerous)