Miss Warren, resolutely bent on banishing every unnatural constraint, asked Mr. Yocomb:

She was lady-like and maidenly in her demeanor, without unnatural constraint or effrontery.

Human nature had systematically and obstinately rebelled, and still rebels, against the unnatural constraint.

Little by little, an unnatural constraint got possession of him.

Late one evening, when he had just returned from he knew not where, Christian tried to put an end to the unnatural constraint between them.

And rightly meaningless: he revolted against the unnatural constraints forbidding him to complete his manhood.