Trust"y (?), a. [Compar. Trustier (?); superl. Trustiest.]
Admitting of being safely trusted; justly deserving confidence; fit to be confided in; trustworthy; reliable.
Your trusty and most valiant servitor.
Hence, not liable to fail; strong; firm.
His trusty sword he called to his aid.
Involving trust; as, a trusty business.
© Webster 1913.