Longman Dictionary of Contemporary English homepage

laborious

 adjective
     
la‧bo‧ri‧ous
taking a lot of time and effort
laborious process/task/business etc
Collecting the raw materials proved a long and laborious task.
the laborious business of drying the crops
—laboriously adverb:
A beetle began to crawl laboriously up his leg.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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