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tr.v. re·strained, re·strain·ing, re·strains
a. To hold back or keep in check; control: was able restrain his emotions.
b. To prevent (a person or group) from doing something or acting in a certain way: She was restrained from selling the house by her fond memories.
2. To hold, fasten, or secure so as to prevent or limit movement: hair restrained by a bandana; a child restrained by a seat belt.

[Middle English restreinen, from Old French restraindre, restreign-, from Latin restringere, to bind back; see restrict.]

re·strain′a·ble adj.
re·strain′ed·ly (-strā′nĭd-lē) adv.
re·strain′er n.
Synonyms: restrain, curb, check, bridle, inhibit
These verbs mean to hold back or keep under control. Restrain implies restriction or limitation, as on one's freedom of action: "a wise and frugal government, which shall restrain men from injuring one another" (Thomas Jefferson).
To curb is to restrain as if with reins: "As a teacher he was rather dull. He curbed his own enthusiasms, finding that they distracted his attention" (E.M. Forster).
Check implies arresting or stopping, often suddenly: "Knowing that Lily disliked to be caressed, she had long ago learned to check her demonstrative impulses toward her friend" (Edith Wharton).
To bridle is often to hold in or govern one's emotions or passions: I tried hard to bridle my anger. Inhibit usually connotes a check on one's actions, thoughts, or emotions: A fear of strangers inhibited his ability to travel.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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I understood why the sweet sensitive lips smiled so rarely and so restrainedly now, and why the clear blue eyes looked at me, sometimes with the pity of an angel, sometimes with the innocent perplexity of a child.
She returned the courtesy a little restrainedly on her side.
Sydney's Catholic newspapers, the Freeman's Journal and the Catholic Press, were critical of the war, the Press boldly so, the Freeman's more restrainedly. The difference in tone had been evident in reporting Sydney's farewell to the first contingent.