It laid out rigid categories of people to be deported, eliminating all human judgment on the facts of each individual case.

It proves impossible to keep to rigid categories when examining this issue.

Never mind that the ancient Greeks didn't have rigid categories for sexual orientation.

There is so much more to say, and these are not hard and rigid categories.

First, he suggests, we are mistaken in thinking that the postwar technological world was dominated by hierarchies and rigid categories.

The trick is to understand and compose music without recourse to rigid categories.

DA avoids using the term budget, as its connotation may imply rigid categories.

Now these rigid categories are as much a thing of the past as the stereotypes they were meant to suit.

The danger is that the respondent may become irritated by rigid categories constraining freedom of reply.

The electronegative series are intended to be guides, not rigid categories.