needing great effort; causing trouble or worry synonym taxing费力的;艰巨的;令人焦虑的 an onerous duty/task/responsibility 繁重的义务/工作/职责
Oxford Collocations DictionaryOnerous is used with these nouns:- burden
- duty
- responsibility
- …
Word Originlate Middle English: from Old French onereus, from Latin onerosus, from onus, oner- ‘burden’.