Trusty

Part of speech: adjective (a.)

1. Admitting of being safely trusted; justly deserving confidence; fit to be confided in; trustworthy; reliable. Your trusty and most valiant servitor. Shak.

2. Hence, not liable to fail; strong; firm. His trusty sword he called to his aid. Spenser.

3. Involving trust; as, a trusty business. [R.] Shak.