unflappable

Jacqueline Kennedy helped change all that in the 1960s, with her unflappable chic and wardrobe full of haute couture.

Until just last year, Eike Batista, now 56, seemed unflappable.

He's been close to unflappable amid a storm of restatements, retractions, and inconsistencies.

To this day, within military aviation, he is famous for his "steel trap" mind and his unflappable demeanor.

Even amid the pressure of maintaining such an unstable power base, Paul recalls an unflappable leader.