1. A business project, undertaking, or initiative that presents significant difficulties and requires considerable effort, skill, or resources to accomplish
Starting a tech startup in a competitive market is a challenging venture.
Iniciar uma startup de tecnologia em um mercado competitivo é um empreendimento desafiador.
2. An ambitious or daring enterprise that tests one's abilities and determination
Building a sustainable business model proved to be a challenging venture.
Construir um modelo de negócio sustentável provou ser um empreendimento desafiador.