This is the 10533rd most frequent Portuguese word.
fiável
Reliable; trustworthy.
Here, 'fiável' is used to describe the dependability of the car.
Este carro é muito fiável e raramente apresenta problemas.
This car is very reliable and rarely presents problems.
In this sentence, 'fiável' refers to the trustworthiness of the data storage system.
Preciso de um sistema fiável para armazenar meus dados importantes.
I need a reliable system to store my important data.
'Fiável' in this usage points to the credibility of the witness in the context of the trial.