1839. Ld. Clarendon, in Maxwell, Life & Lett. (1913), I. 155. I am of a mature age, unexcitable temperament.
1859. Cornwallis, New World, I. 297. He did the work simply as a means of living, and he liked it because it was dry and unexcitable.
1895. Outing, XXVI. 432/1. During this battle royal, the other fish had darted away, and only the unexcitable sturgeon was to be seen.
Hence Unexcitability.
1885. E. G. Parry, Suakin, ix. 215. Whether the extreme unexcitability of temperament of these people is the result of dulness of intellect, or that they are altogether emotionless, I do not know.