1. to act or speak with strong conviction, vigor, and authority; to assert oneself powerfully
The manager decided to be forceful in addressing the team's performance issues.
O gerente decidiu ser assertivo ao abordar os problemas de desempenho da equipe.
2. to exert physical or mental strength in a compelling manner
She was forceful in her arguments during the debate.
Ela foi enérgica em seus argumentos durante o debate.