How to succinctly describe a group composed of those for whom a given condition is false and those for whom the state of the condition is not known?

For example, if I’m talking about height, and I want to split the world into two groups based on whether or not I have seen that they are taller than me.

The first group is composed of only the people who are taller than me whom I have also seen.

The second group is composed of everyone I haven’t seen — regardless of their height — as well as people whom I have seen who are also shorter than me.

Is there an easy way to express the second group composed of both negatives and unknowns?