unflappable

"It's blackmail," insists The Edge, the famously unflappable guitarist seeming temporarily flapped.

“The unflappable Pointer sails above the general mayhem with a ladylike aplomb that makes her subsequent emotional epiphany all the more moving,” The Times wrote about Pointer’s performance in that show.

While Piastri keeps a very even keel, and gives the impression of being unflappable, Norris wears his heart on his sleeve, and lives his failings publicly.

He has worked at the show since 2001 and has absorbed the boss’s unflappable steadiness, with a tinge of the long-suffering.”

When she was informed of the full story in the 1970s, she was characteristically unflappable, taking it "all very calmly and without surprise", according to the declassified files released to the National Archives.