non linear

柯林斯词典

also non-linear

1. ADJ If you describe something as nonlinear, you mean that it does not progress or develop smoothly from one stage to the next in a logical way. Instead, it makes sudden changes, or seems to develop in different directions at the same time. 不符合逻辑的; 非线性的
Environmental systems tend to be nonlinear, and therefore not easy to predict. 环境系统一般是非线性的，所以很难预测。