aplomb, balance, balanced personality, constancy, cool, equilibrium, fastness, firmness, imperturbability, invariability, nerve, reliability, rootedness, sang-froid, secureness, security, solidity, soundness, stability, stable equilibrium, stable state, steadfastness, steadiness, steady nerves, steady state, substantiality, undeflectability, uniformity, unshakable nerves, unshakableness