anticlastic
/ˌæntɪkˈlæstɪk/Definitions
1. adjective
Bending or curving in the opposite direction of the ordinary or normal curve; having a shape that is the opposite of what is usual or expected.
“The architect designed an anticlastic arch that added a unique touch to the building’s facade.”
2. noun
A curve or shape that is the opposite of what is usual or expected.
“The artist used the anticlastic curve of the sculpture to create a sense of tension and drama.”