1. in a way that involves trouble, difficulty, or hardship; burdensome

Examples

• The new regulations were onerously complex for small businesses.
• She was onerously burdened with debt after college.
• The contract terms were onerously restrictive.
• The paperwork requirements were onerously detailed.
• The tax was onerously high for middle-class families.
• The job demanded onerously long hours every week.