irrational fear
4.A persistent, abnormal, or irrational fear of a specific thing or situation that compels one to avoid the feared stimulus.
5.This "irrational fear" is a result of being over-sensitive. It is also the legacy of a particular time and situation.
7.A phobia is an irrational and often unexplainable fear that causes an uncontrolable physical reaction.
8.Humankind after all is an emotional creature and it should be quite all right to be irrational. As the saying goes: "A Buddhist monk does not spend more than three nights under the same mulberry tree, for fear of emotional attachment." As we all know, Buddhism very simply holds that all things will eventually come to naught. If a Buddhist monk should fear the risk of emotional attachment to the mulberry tree with just three nights under it, what more can be asked of us ordinary mortals?

