trusty /ˈtɹʌsti/adjective 1noun 1forms 3 adjective1 •Reliable or trustworthy.She's been using the same trusty sewing machine since she started out, thirty long years ago. noun1 •A trusted person, especially a prisoner who has been granted special privileges.We usta have a rule that if a trusty shot an escaping convict, then the trusty would go free. — 1941 formstrusties · trustier · trustiest