Definition of laboriously adverb from the Oxford Advanced Learner's Dictionary

 

laboriously

 adverb
adverb
BrE BrE//ləˈbɔːriəsli//
 
; NAmE NAmE//ləˈbɔːriəsli//
 
 
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in a way that takes a lot of time and effort An agreement was laboriously worked out.