I work in security and I am asked all the time about the likelihood of horrible things which may happen. I cannot, ever, give a percentage ("70% chance we will

I work in security and I am asked all the time about the likelihood of horrible things which may happen. I cannot, ever, give a percentage ("70% chance we will get hacked if this and that"). I either say that I do it know and nobody will, or use "probably" or "unlikely". These are wide, hand waving categories. I do that not because I do not want to be wrong but just because I have only a vague idea, classified into "maybe" and "maybe not"