1. Careful, persistent, and conscientious work or attempt to accomplish something
Her diligent effort on the project resulted in excellent results.
Seu esforço diligente no projeto resultou em resultados excelentes.
2. Sustained and meticulous application of energy and attention to a task
Through diligent effort, he managed to master the difficult language.
Através do esforço diligente, ele conseguiu dominar o idioma difícil.