Simple past tense and past participle of unseat.(verb)
Wiktionary.org : Text is available under the Creative Commons Attribution-ShareAlike License
Use "unseated" in a sentence
"The perfect exit strategy for Hillary Clinton would be to accept the DNC's position that Florida and Michigan delegates should remain unseated, a decision that Hillary Clinton supported until the numbers didn't work out to her benefit, instead of insisting that she had nothing to do with it and those voters are now disenfranchised."
"Basically, the MP he just unseated is Oona King, who is both black and Jewish."
"WR: Ernest Wilford, Jacksonville — No-name unseated a No. 1 pick and caught six TD passes."