aplomb \uh-PLOM\, noun:
Assurance of manner or of action; self-possession; confidence; coolness.
For all the slings and arrows, he seems almost preternaturally good-natured; set upon by a group of drunken revelers at dinner in Des Moines, . . . he weathers their boozy blandishments and inevitable potato jokes with admirable grace and aplomb.
-- "Quayle Running Against His Own Image", Los Angeles Times, August 1, 1999