1. A challenging or complex project, task, or business venture that requires significant effort, resources, or skill to accomplish
Starting a new company in a competitive market is a difficult undertaking.
Iniciar uma nova empresa em um mercado competitivo é um empreendimento difícil.
2. An ambitious or risky endeavor with uncertain outcomes
Climbing Mount Everest without proper training is a difficult undertaking.
Escalar o Monte Everest sem treinamento adequado é um empreendimento difícil.