Synonyms to self-possession

aplomb, assurance, balance, balanced personality, composure, confidence, constancy, constraint, control, cool, coolness, discipline, ease, easiness, equability, equanimity, equilibrium, erectness, fastness, firmness, homeostasis, imperturbability, independence, invariability, level head, levelheadedness, nerve, nonchalance, orthogonality, perpendicularity, plumbness, plungingness, poise, possession, precipitousness, presence of mind, reliability, restraint, right-angledness, right-angularity, rootedness, sang-froid, sangfroid, savoir faire, secureness, security, self-assurance, self-command, self-confidence, self-conquest, self-control, self-denial, self-discipline, self-government, self-mastery, self-restraint, sheerness, solidity, soundness, squareness, stability, stable equilibrium, stable state, steadfastness, steadiness, steady nerves, steady state, steepness, substantiality, undeflectability, uniformity, unshakable nerves, unshakableness, up-and-downness, uprightness, verticalism, verticality, verticalness, well-regulated mind, Bible oath, absolute certain