(of a task, duty, or responsibility)involving an amount of effort and difficulty which is oppressively burdensome
(任务、责任等)繁重的;费力的;困难的
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he found his duties increasingly onerous .他发现自己的职责越来越繁重了。
【律】 义务沉重的
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an onerous lease .义务沉重的租赁。
"late Middle English: from Old French