"Irrational behavior" refers to actions or decisions that are not based on facts, logic, or reason. It means behaving in a way that does not make sense or is not reasonable. Full definition
Why is this, and why are women telling their stories of irrational behaviour in order to keep these not - so - nice men? (womenshealthandfitness.com.au)
One of the components of this cycle is often drama, emotion, even irrational behaviour. (remonline.com)
The highs and lows of equity ownership can feed all kinds of irrational behaviour, from panic - selling in the face of loss to piling into a bubble market. (monevator.com)