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onerous

adjective
🔊/ˈəʊnərəs/
🔊/ˈəʊnərəs/, 🔊/ˈɑːnərəs/
(formal)
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  1. needing great effort; causing trouble or worry费力的；艰巨的；令人焦虑的 synonym taxing
    • 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
    • …
    See full entry
    Word Originlate Middle English: from Old French onereus, from Latin onerosus, from onus, oner- ‘burden’.