trusty
Concise Oxford English Dictionary © 2008 Oxford University Press:
trusty/ˈtrʌsti/
▶adjective (trustier, trustiest) archaic or humorous reliable or faithful: their trusty steeds. ▶noun (pl. trusties) a prisoner who is given special privileges or responsibilities in return for good behaviour.
– derivatives
trustily adverb,
trustiness noun.
trustily adverb,
trustiness noun.
'trusty' also found in these Oxford entries:

