The quality of being excitable, excitability.(noun)
Wiktionary.org : Text is available under the Creative Commons Attribution-ShareAlike License
Use "excitableness" in a sentence
"The half-breed had not much excitableness in his nature, but when he saw this beautiful woman with a touch of the Indian in her contour, his pale face flushed, and he showed his set teeth under his slight moustache."
"They might even sometimes excite readers who possessed an adjustable "tally" of excitableness."
"Her own unsatisfied nature, her excitableness, her openness to all influences from the external world, and her incapacity for supplying her needs in any approximate degree from inward resources; her consequent changeableness, moodiness, and dependency -- were all unfavourable influences upon an invalid who loved her."