Reliable (adjective)

1. Able to be trusted or believed.
2. Consistently good in quality or performance; able to be relied on.

Origin:

Mid 17th century: from french fiable or latin fidelis "faithful" + -able.

Examples:

1. The source is reliable.
2. He is a reliable employee.
3. The car is reliable.
4. The information is reliable.
5. The witness is not reliable.