1. most reliable, dependable, or faithful (superlative form of trusty)
Usage: superlative form

Examples

• She turned to her trustiest friend for advice during the crisis.
• The captain chose his trustiest crew members for the dangerous mission.
• This old hammer is my trustiest tool in the workshop.
• He relied on his trustiest advisors to help make the difficult decision.
• The trustiest employees were given the most important responsibilities.
• Among all her companions, the dog proved to be the trustiest.