English

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

 

laborious

 adjective
adjective
BrE BrE//ləˈbɔːriəs//
 
; NAmE NAmE//ləˈbɔːriəs//
 
 
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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. Word Origin late Middle English (also in the sense ‘industrious, assiduous’): from Old French laborieux, from Latin laboriosus, from labor ‘labour’.
See the Oxford Advanced American Dictionary entry: laborious