1. An explanation that is supported by solid evidence, logical reasoning, or valid facts; a clarification based on sound reasoning and substantiated information
The scientist provided a well-founded explanation for the experimental results based on years of research.
O cientista forneceu uma explicação bem fundamentada para os resultados experimentais baseada em anos de pesquisa.
2. A justification or account that rests on reliable grounds and is not based on speculation or assumption
Her well-founded explanation for the delay convinced the committee.
Sua explicação bem fundamentada para o atraso convenceu o comitê.