Trusty (adjective)

1. Reliable and dependable.
2. Serving as a trusty.

Origin:

Middle english, from old english trēowe; akin to old high german gatrōwe loyal, old english trēow tree.

Examples:

1. She always carried a trusty pen in her purse.
2. He was a trusty companion on many adventures.
3. The company's trusty delivery trucks are a common sight in the city.
4. He was a trusty employee for many years.
5. That old car may not look like much, but it's a trusty vehicle.