Torturous (adjective)

Involving or causing torture; extremely painful or unpleasant.

Origin:

From the latin word "tortura" meaning "torture".

Examples:

1. The journey was torturous and it took many days to reach the destination.
2. The torturous conditions in the prison were inhumane.
3. The surgery was torturous and it took a long time to recover.
4. The torturous treatment was used to extract information from the prisoner.
5. The torturous heat made it difficult to sleep at night.