Simple past tense and past participle of imprison.(verb)
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Use "imprisoned" in a sentence
"So if he is not extremely vigilant throughout his house and grounds, he may be caught with a hundred dollar fine, OR be imprisoned three months in the House of Correction at the pleasure of the magistrate!! and for every subsequent offense may be _imprisoned in the House of Correction_ as much as one year, and then required to give security for obeying the law."
"Birtukan is let out of prison, but tens of thousands of others remain imprisoned for their political beliefs."
"(From Amazon. com): With King Olin imprisoned and Prince Kendrick slain, the royal twins Barrick and Briony have been forced to flee their homeland."