trusty
adjective
[ ˈtrʌsti ]
• having served for a long time and regarded as reliable or faithful.
• "my trusty old Morris Minor"
Similar:
reliable,
dependable,
trustworthy,
never-failing,
unfailing,
tried and true,
tried and trusted,
trusted,
loyal,
faithful,
true,
honest,
staunch,
steadfast,
constant,
unswerving,
unwavering,
trusty
noun
• a prisoner who is given special privileges or responsibilities in return for good behaviour.