Laborious (adjective)

1. Requiring a lot of effort and hard work.
2. Tedious and time-consuming.

Origin:

Late middle english: from old french laborieus, from latin laboriosus, from labor "toil".

Examples:

1. The task was laborious and took several hours to complete.
2. The process of organizing the event was laborious, but the result was worth it.
3. The research was laborious, but it yielded valuable results.
4. The climb up the mountain was laborious, but the view from the top was breathtaking.
5. The laborious task of sorting through all the data took days to finish.