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laborious

adjective
 
 
/ləˈbɔː.ri.əs/ US  /-ˈbɔːr.i-/

Definition

needing a lot of time and effort: a laborious taskComplicated and difficult to doDifficult to understand laboriously
 
 
/-li/ adverb
He wrote out the list laboriously by hand.Complicated and difficult to doDifficult to understand
(Definition of laborious adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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