Mulishnesses [noun]
Definition of Mulishnesses:
obstinacy
Sentence/Example of Mulishnesses:
When very highly developed with the reasoning powers weak it often manifests as stubborness, mulishness, obstinacy, etc.
He put it down to his own mulishness that he had hung on and had learned through the little boy of her removal from the palace.
"Humph," half laughed the lawyer, though with obvious disgust at the mulishness in Peter's face and voice.