unexcitability

I guessed at stamina and an unexcitability that might take a tiring amateur steadfastly towards the finish line, and if there were anything against him at first sight it was, perhaps, that he was a bit short in the neck.

Penalty Francis, Dick 1997

In keeping with his unexcitability and his almost psychotic complacency, he waited quietly for certain further developments of his experiments in the temple laboratory.

Blockade, Lepso Brand, Kurt 1976

Whether from their effect or from Nature's curative power in despite of them, my ailments at last mostly disappeared; but to this very hour I have been more or less subject to the same physical inertness and unexcitability, low spirits, and many like symptoms.

The Opium Habit Horace B. Day

You may deny it and talk about the unexcitability of the American citizen and all that bunk, but let me tell you that your journalists and moving picture producers and preachers and politicians have caught on to the fact that man is jumpy, and they trade on their discovery, believe me.

The Best Short Stories of 1921 and the Yearbook of the American Short Story Various 1915

(and the only criticism to be brought against him is that he sometimes chooses -- think of that -- chooses to live outside his native State!) you wonder at the clear-eyed composure, the calm-visioned unexcitability with which he views the metropolis.

The Native Son Inez Haynes Gillmore 1921