Exertion, trying effort, instead of easy, happy activity induces hampering rigidities.
"Resonance in Singing and Speaking"
Thomas Fillebrown
They were as her still living voice in his ears, and as the words sank into memory they pierced through all the rigidities of a noble nature, rending and kneading as they went.
"Harvest"
Mrs. Humphry Ward
From this expose which I have selected from the most reliable authors, I have separated all anatomical rigidities, and scientific abstractions.
"The Physiology of Taste"
Brillat Savarin