aplomb

aplomb
    n 1: great coolness and composure under strain; "keep your cool"
         [syn: {aplomb}, {assuredness}, {cool}, {poise}, {sang-
         froid}]
    

Aplomb \A`plomb"\, n. [F., lit. perpendicularity; ? to + plomb
   lead. See {Plumb}.]
   Assurance of manner or of action; self-possession.
   [1913 Webster]
    

79 Moby Thesaurus words for "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-possession, 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