1. to reduce or diminish someone's resolve, willpower, or commitment to achieve a goal
The constant criticism began to weaken his determination to finish the project.
As críticas constantes começaram a enfraquecer sua determinação de terminar o projeto.
2. to cause someone to lose confidence or conviction in their purpose
Nothing could weaken her determination to succeed in her career.
Nada poderia enfraquecer sua determinação de ter sucesso em sua carreira.