Two major findings of this research are that people are internally consistent in their use of these expressions and that there is a great between-subject variability. The probabilistic meaning of the phrases is also shown to be highly context sensitive, with an asymmetry and a large overlap between different phrases. Variability of verbal expressions is severly underestimated by people using them and verbal communication poses the danger of considerable misunderstandings. On the other hand, there exist phrases that most of the people agree upon and a careful choice of a small vocabulary is able to facilitate precise communication. Appendix gives a list of all verbal uncertainty phrases encountered in the literature.