A firm belief in one's own powers:
assurance, confidence, self-assurance, self-confidence, self-possession. See attitude, beliefA stable, calm state of the emotions:
balance, collectedness, composure, coolness, equanimity, imperturbability, imperturbableness, nonchalance, poise, sang-froid, self-possession, unflappability. (Slang) cool. See calm, feelings
Learn more about aplomb