1. A task or assignment that presents significant difficulties and requires considerable effort, skill, or determination to accomplish
The team accepted the challenging mission to rescue the stranded climbers.
A equipe aceitou a missão desafiadora de resgatar os alpinistas presos.
2. An objective that tests one's abilities and pushes beyond normal limits
Teaching in underfunded schools is a challenging mission for dedicated educators.
Ensinar em escolas mal financiadas é uma missão desafiadora para educadores dedicados.