"Uncertain" also has a meaning outside the uncertainty principle. When we say that a measurement has uncertainty, we usually mean that it has some fixed value, but our tools are not capable of measuring it beyond some limit.

Almost all terms in mathematics and science are overloaded in ways like that. For example, what is the "basis" for a mathematical space?

Good point. Uncertainty colloquially does admit the possibility of "no true value" embarrassingly as a scientist, I forgot the stat definition.