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Definition of laborious adjective from the Oxford Advanced American Dictionary

 

laborious

 adjective
adjective
NAmE//ləˈbɔriəs//
 
 
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taking a lot of time and effort synonym onerous, taxing a laborious task/process Checking all the information will be slow and laborious.
 
adverb An agreement was laboriously worked out.
See laborious in the Oxford Advanced Learner's Dictionary