mulishness (noun)

1. The mulishness of the building's design made it incredibly challenging for the architects to create a functional and aesthetically pleasing space.

2. The mulishness of the British resistance during the American Revolutionary War prolonged the conflict and made it difficult for the colonists to gain independence.

3. Why did the stubborn mule go to therapy? Because it wanted to work on its mulishness!

4. The artist captured the mulishness of a wilful child in their painting, depicting a scene of a tantrum in vibrant colors and exaggerated brushstrokes.