The old well is a 'dependable' source of water. [=there is always water in the old well]
He's the team's most 'dependable' [='consistent'] player.
a 'dependable' [='reliable'] old car
(..) ...but I will lose the customer forever to Pizza Yurt. Look, you are my only hope, all right? You have to make it in time. Peter, you're a nice guy. But you're just not dependable. This is your last chance. You have to go blocks in / minutes or your ass is fired. Go! Hey, what, are you stupid? (..)2004 Spider-Man 2