Reliable means that you can trust someone or something to consistently do what they are supposed to do, without letting you down or causing any problems. Full definition
They have taught and trained drivers for over three decades and is the most reliable driving school in the state. (drivertrainingassociates.com)
Dogs need reliable sources of protein to stay healthy and to have strong muscles and they also need a good source of easy to digest carbohydrates that would allow them to move and jump. (usbones.com)
On top of that, SSD makers across the board are calling their drives more reliable than conventional hard drives. (anandtech.com)