1. A project, task, or enterprise that did not succeed or achieve its intended goals
The construction project was a failed undertaking that cost millions of dollars.
A empreitada fracassada custou milhões de reais e deixou o investidor arruinado.
2. Any business venture or contract work that resulted in failure or loss
His startup was a failed undertaking from the beginning.
Sua empreitada fracassada no mercado imobiliário o deixou endividado.