When something is not estimated, is it correct to say that it is unestimated or non-estimated?
For example, in certain project management techniques, tasks can be "estimated" which means one or more humans have given an estimate on the expected cost, effort, or duration of the task. Here, "estimated" is used as an attribute of the task, so a task is either "estimated" or "not estimated". In some texts, I have seen the expression "unestimated task" (or with a hyphen, "un-estimated") or "nonestimated task" (or with a hyphen, "non-estimated").
Are any of these correct English?
(The context here is software projects, so a sub-question is whether any of these expressions can be considered part of the professional English vocabulary in that field.)