1
onerous + noun
作定语时，常修饰 task、duty、responsibility、obligation 等表示任务或义务的名词。
She was given an onerous task.
她接到一项繁重的任务。
繁重的；艰巨的
先理解核心含义，再看它在真实句子里的用法。
繁重的；艰巨的
difficult to bear or deal with; burdensome
She was given an onerous task.
她接到一项繁重的任务。
构成身体、精神或象征性负担,须费力才能承受；繁重的。
Imposing or constituting a physical, mental, or figurative load which can be borne only with effort; burdensome.
难以承受的；令人疲惫的
not easily borne; wearing
The new manager found the weekly reports an onerous task, so she asked her team for help.
新经理觉得每周报告是一项繁重的任务，于是请团队帮忙。
AI contextual example
He agreed to help, but the onerous schedule soon exhausted him.
他同意帮忙，但繁重的日程很快让他精疲力竭。
AI contextual example
Signing the contract put them under an onerous obligation to deliver goods every month.
签署合同让他们背负了每月交货的繁重义务。
AI contextual example
my duties weren't onerous; I only had to greet the guests
我的职责并不繁重,只需要迎接客人。
WordNet
作定语时，常修饰 task、duty、responsibility、obligation 等表示任务或义务的名词。
She was given an onerous task.
她接到一项繁重的任务。
find 后接宾语和形容词补足语，表示“觉得……繁重”；宾语后不加 as。
Many employees find the new reporting requirements onerous.
许多员工觉得新的报告要求很繁重。
it 是形式主语，真正的主语是不定式；这一句式多用于正式场合。
It is onerous to keep up with all the paperwork.
要应付所有这些文书工作是很繁重的。
Not this
The onerous of organizing the event fell on me.
Use this
The onus of organizing the event fell on me.
onerous 是形容词，意为“繁重的、负有义务的”，不能当名词用。这里表达“责任、负担”，应使用名词 onus。
Not this
The long climb was onerous, so we frequently stopped to rest.
Use this
The long climb was arduous, so we frequently stopped to rest.
onerous 强调因义务或责任带来的沉重负担，指爬山这类需要大量体力的事情时，英语更常用 arduous（艰苦的、费力的）。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
繁重的任务
Cleaning the entire house before the guests arrived proved to be an onerous task.
在客人到来之前打扫整栋房子被证明是一项繁重的任务。
沉重的负担
The new regulations place an onerous burden on small businesses.
新规定给小企业带来了沉重的负担。
繁重的责任
As the project manager, she had the onerous responsibility of coordinating all the teams.
作为项目经理，她肩负着协调所有团队的繁重责任。
繁重的义务
The treaty imposed onerous obligations on the defeated nation.
条约给战败国强加了繁重的义务。
繁重的要求
The job made onerous demands on her time.
这份工作对她的时间提出了繁重的要求。
艰巨的职责
He felt the onerous duty of caring for his aging parents.
他感到照顾年迈父母是一项艰巨的职责。
Use onerous naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
记忆联想：onus 本有“负担”之意，onerous 像“被负担压着”，想象巨石压肩、任务繁重。
语域：formal 常见场景：法律条款、商务合同、正式报告 通常用于正式场合，多出现在法律、商务或官方书面语中，形容义务、任务等繁重而难以承受；日常口语中较少用。
这些词与 onerous 在拼写或发音上有相似点，但都不完全押韵。onus 与 onerous 的开头都读 /oʊn/；后五个词都以弱读的 /ərəs/ 结尾，且拼写为 -erous/-orous。不过 onerous 的重读元音是 /oʊ/，且重音在第一音节，与其他词的元音或重音不同，学习时需注意区分。
Dictionary facts from ECDICT, WIKTIONARY.