1. A serious, sincere, and determined effort to accomplish or achieve something
Despite the challenges, she made an earnest attempt to finish the project on time.
Apesar dos desafios, ela fez uma tentativa sincera de terminar o projeto no prazo.
2. A genuine try that shows commitment and conviction, rather than a halfhearted effort
His earnest attempt to learn Portuguese impressed his new colleagues.
Sua tentativa sincera de aprender português impressionou seus novos colegas.