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Definition of onerous adjective from the Oxford Advanced Learner's Dictionary

onerous

adjective
 
/ˈəʊnərəs/
 
/ˈəʊnərəs/,
 
/ˈɑːnərəs/
(formal)
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  1. needing great effort; causing trouble or worry synonym taxing
    • an onerous duty/task/responsibility
    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’.
See onerous in the Oxford Advanced American Dictionary
Check pronunciation: onerous

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