irrationality; unreason; the irrational。
双语例句：
1、这对当下而言是个巨大挑战，可能需要“非理性”的回应。
This is a grand challenge for our age and it may require an "irrational" response.
2、他们不是非理性的，或者有杀人倾向的什么人。
They're not irrational, potentially homicidal maniacs, to start。
3、就像对转基因的非理性恐惧一样，其实一般来讲，我们人类足够英明，能够快速小心地处理好这些问题。
As with hysteria about genetic modification, we humans are generally wise enough to manage these problems with speed and care.
北极星爱吃鱼
