来自拉丁语onus的所有格oneris,负担，重担，词源同onus.引申词义费力的，艰巨的。

1. My household duties were not particularly onerous.

我的家务活并不繁重.

2. This obligation sometimes proves onerous.

这一义务有时被证明是艰巨的.

3. She desired a fixed occupation - no matter how onerous, how irksome.

她希望有个固定的职业,不管这个职业多么繁重, 多么令人厌倦.

4. This is the most onerous task I have ever undertaken.

这是我承担过的最艰巨的任务.

5. The job had become reduced quickly to its onerous humiliating routine.

他的工作很快就缩小到只剩些烦琐的例行公事,干着也觉得很不光彩.