Synonyms and related words :
accordance, aplomb, assurance, ataraxy, balance, calm, calmness, composure, confidence, consistency, consonance, constancy, continuity, coolness, correspondence, detachment, equability, equilibrium, equipoise, evenness, homogeneity, imperturbability, level head, levelheadedness, monolithism, persistence, phlegm, placidity, poise, possession, presence of mind, restraint, sangfroid, self-assurance, self-command, self-confidence, self-control, self-possession, self-restraint, serenity, stability, steadfastness, steadiness, tranquillity, uniformity, unity, unruffledness, well-regulated mind