Definitions:

1. Describes something that is burdensome, difficult, or unpleasant to deal with, often because it involves a lot of effort, responsibility, or hardship. ADJECTIVE
   • Filing taxes can be an onerous task for small business owners.
2. Imposing or constituting a physical, mental, or fugurative load which can be borne only with effort. ADJECTIVE
   • Caring for a loved one with a chronic illness can become emotionally and physically onerous.
3. Involving a great deal of effort, difficulty, or trouble, especially more than seems reasonable or fair. ADJECTIVE
   • The contract placed onerous obligations on the tenant.

Synonyms:

• arduous
• burdensome
• heavy
• oppressive
• taxing
• troublesome

NearBy Words:

• onerously
• onerousness