unirritable

When she was pleased, or merely unirritable, she brimmed with mischief.

Incubus

He knew he had always been an entirely selfish man and that he was entirely selfish still, and was not revoltingly fretful and domineering only because he was constitutionally unirritable.

T. Tembarom

I am not indeed certain, that the nerve was not at the same time included in the ligature, and thus the lymphatic rendered unirritable or lifeless; but this however is certain, that it is not any quantity of any stimulus, which induces the vessels of animal bodies to revert their motions; but a certain quantity of a certain stimulus, as appears from wounds in the stomach, which do not produce vomiting; and wounds of the intestines, which do not produce the cholera morbus.

Zoonomia, Vol. I Or, the Laws of Organic Life

And when we have thus attained the summit of vegetable powers and vegetable life, it will require, I think, no great stretch of the imagination to conceive that the fibrous irritability of animals, as well as vegetables, is the mere result of a peculiar arrangement of simple and unirritable material atoms. "

Modern Atheism under its forms of Pantheism, Materialism, Secularism, Development, and Natural Laws