1. to cause someone to feel annoyed, disappointed, or upset because they are unable to achieve something
The constant delays frustrated the passengers.
Os atrasos constantes frustraram os passageiros.
2. to prevent something from being successful or from being achieved
The bad weather frustrated our plans for the picnic.
O mau tempo frustrou nossos planos para o piquenique.
3. to block or thwart an effort or attempt
Security measures frustrated the thieves' attempt to rob the bank.
As medidas de segurança frustraram a tentativa dos ladrões de roubar o banco.