1. A project that presents significant difficulties, obstacles, or demands considerable effort, skills, and resources to complete successfully
The company took on a challenging project to develop new sustainable technology.
A empresa assumiu um projeto desafiador para desenvolver uma nova tecnologia sustentável.
2. An undertaking that tests one's abilities, creativity, or problem-solving skills
Building a bridge in remote terrain is a challenging project for any engineering team.
Construir uma ponte em terreno remoto é um projeto desafiador para qualquer equipe de engenharia.