1. An option or choice that is not feasible, realistic, or capable of being put into practice due to practical constraints, cost, time, or resources
Using a horse-drawn carriage as an impractical alternative to modern transportation.
Usar uma carruagem puxada por cavalos como uma alternativa impraticável ao transporte moderno.
2. A solution or approach that sounds theoretically good but lacks viability in real-world application
Building a bridge across the ocean was deemed an impractical alternative to the existing tunnel.
Construir uma ponte através do oceano foi considerada uma alternativa impraticável ao túnel existente.