dependable
Able to be trusted to do what you should do.
Dependable means you can be counted on to do what you say you'll do, show up when you're supposed to, and follow through on your responsibilities. A dependable friend remembers to return the book they borrowed. A dependable student completes their homework on time. A dependable teammate shows up for practice ready to work.
The word suggests consistency and reliability. Someone might be nice occasionally or helpful when they feel like it, but a dependable person delivers steadily, even when it's inconvenient. If your mom asks you to feed the dog every morning, being dependable means the dog gets fed whether you're tired, busy, or would rather play video games.
Dependable people build trust over time. When you prove yourself dependable with small things, people trust you with bigger responsibilities. A dependable babysitter gets called back. A dependable employee earns more responsibility.