Simple past tense and past participle of counterplot.(verb)
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Use "counterplotted" in a sentence
"In no other way can be explained the madness which sped the victims of that tragedy to their ruin; for with the enemy at their very gates, the Muslims set up and displaced kings, plotted and counterplotted."
"She not only watched complacently the butcheries of Alva, but she plotted and counterplotted, now offering aid to the Prince of"
"Snares had been laid for him in vain; every wile had proved abortive, every plot had been counterplotted."