1. able to be trusted to do what is expected; dependable
2. consistently good in quality or performance; not likely to fail

Examples

• She is a reliable employee who always meets her deadlines.
• This car has been very reliable for the past ten years.
• We need reliable information before making a decision.
• The weather forecast is usually reliable in this region.
• He’s not a reliable source for gossip.
• The old printer is still reliable despite its age.
• Parents want reliable childcare for their children.