The term 'irrationally fearful' can be summed up as 'PARANOID'. PARANOID is an adjective used to describe someone who has an irrational fear or suspicion of others, often leading to feelings of persecution and mistrust. This type of fear can be caused by a variety of factors, including past trauma, mental illness, or even a general feeling of insecurity. It is important to note that paranoia is not the same as being cautious or aware of potential danger; it is an irrational fear that can lead to extreme behavior.