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laborious (adj) needing a lot of effort and time.
A laborious job requires a lot of effort and time. A laborious task takes a lot of effort and a long time to be completed. Gathering information for a project needs a lot of hard work and takes a long time. Therefore it is a laborious job.
- Compiling a dictionary, even in this computer age, is a laborious job involving a lot of work collecting words, their meanings, their origin, etc., and then collating them all.
- His thesis on European folk art was the result of a laborious task. He traveled patiently to various communities and spent a lot of time gathering information and collating it.