1. A simple, basic, or unsophisticated way of doing something; a technique that lacks refinement or precision
They used a crude method to extract the oil from the seeds.
Eles usaram um método rudimentar para extrair o óleo das sementes.
2. An elementary approach that may be effective but lacks elegance or efficiency
The crude method worked, but a more refined approach would have been faster.
O método rudimentar funcionou, mas uma abordagem mais refinada teria sido mais rápida.