on·er·ous
adjective/ˈəʊnərəs/
/ˈəʊnərəs/, /ˈɑːnərəs/
(formal)- needing great effort; causing trouble or worry
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’. - an onerous duty/task/responsibility