“Ambiguous” means having several possible meanings, interpretations or outcomes. Some people don’t like ambiguous situations where new variables can pop up any time, or where novel outcomes emerge rather than being designed from the beginning. It has to be Either/Or. One way or the other. They get nervous in the face of the unknown. They’ll say: “Let’s nail this down.” “Let’s choose one and go for it,” way before an idea has been fully developed. At some point that approach may be necessary. But rigid people like to get closure on one meaning, one interpretation, one outcome, as early as possible. And often that approach leaves out the contributions of other people. It certainly leaves out the possibility of novelty and serendipity.