uncertainty; uncertainty principle, Heisenberg's uncertainty principle.

Yet Sir Thomas tells us that these doubts arose not only from the uncertainty men were in whether Perkin Warbeck was the true duke of York, "but for that also that all things were so covertly demeaned, one thing pretended and another meant, that there was nothing so plain and openly proved but that yet, for the common custom of close and covert dealing, men had it ever inwardly suspect."