concealing one's talents, status, intentions, etc.; maintaining a strict incognito; self-effacement

The Six Secret Teachings and The Three Strategies of Huang Shigong (two ancient Chinese military treatises)

secrets (of the art of war, etc.); mysteries

concealing one's talents, position, status, intentions, etc.

propensity to efface oneself; being prone to conceal one's talent

strategy; tactics