trustworthy, reliable, confidential, Metaphorically: a position, secretary, assistant, representative

secretaryship, secretariat, the work or office of a secretary

chief secretary

personal secretary

general secretary

honorary secretary

a person upon whom one leans or relies, an object of reliance, a stay, support, hope, one in whom confidence is placed

a trustee

civilised, cultured, enlightened, urbane, refined

remains for long time, long-lived, continuing, extending (time, etc.)

a joint secretary