• WordNet 3.6
    • n unconstraint the trait of lacking restraint or control; reckless freedom from inhibition or worry "she danced with abandon"
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Webster's Revised Unabridged Dictionary
    • n Unconstraint Freedom from constraint; ease.
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Century Dictionary and Cyclopedia
    • n unconstraint Freedom from constraint; ease.
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In literature:

How chaste this lovely young wife was in her unconstraint!
"A Romance of Youth, Complete" by Francois Coppee
It is calculated to inspire unconstraint and confidence into every breast.
"Four Early Pamphlets" by William Godwin
What good humor, what unconstraint, what delightful ease!
"Women of Modern France" by Hugo P. Thieme
Like many other vulgar men in similar circumstances, he wondered at the ease and unconstraint he felt in such choice company!
"Davenport Dunn, Volume 1 (of 2) A Man Of Our Day" by Charles James Lever
What good humor, what unconstraint, what delightful ease!
"Women of Modern France (Illustrated)" by Hugo Paul Thieme (1870-1940)
The old red blood and stainless gentility of great poets will be proved by their unconstraint.
"The Oxford Book of American Essays" by Various
He made no approach to familiarity, scarcely to unconstraint.
"Chronicles of Dustypore" by Henry Stewart Cunningham
So that his costume was beyond reproach, and he wore it with as much ease and unconstraint as he displayed in his old coat.
"The Bashful Lover (Novels of Paul de Kock Volume XIX)" by Charles Paul de Kock

In poetry:

While gemmy diadem thrown down beside,
And garment, at the neck plucked open, proved
His unconstraint, and scorn of regal pride,
When thus apart retired, he sat with those he loved.
"Sardius In His Pavilion With Altheetor" by Maria Gowen Brooks

In science:

Notice that the wave equations (4) evolve in an unconstraint manner with respect to (5).
Numerical Integration of Nonlinear Wave Equations for General Relativity