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Definition of onerous adjective from the Oxford Advanced American Dictionary

 

onerous

 adjective
adjective
NAmE//ˈɑnərəs//
 
, NAmE//ˈoʊnərəs//
 
(formal)
 
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needing great effort; causing trouble or worry synonym taxing an onerous duty/task/responsibility
See onerous in the Oxford Advanced Learner's Dictionary
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