(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 he found his duties increasingly onerous. 他发现自己的职责越来越繁重了。 ■(Law)involving heavy obligations (律)义务繁多的 an onerous lease. 义务繁多的租赁。
派生 onerously adverb onerousness noun 语源
late Middle English: from Old French onereus, from Latin onerosus, from onus, oner- 'burden'