Calling some arguments borderline “frivolous,” a Connecticut Appellate Court has rejected a New Canaan man’s appeal of the state Superior Court’s decision to uphold the findings of the American Arbitration Association in connection with a $7.8 million award against him. Judge C.J. DiPentima in an opinion published Tuesday (embedded below) said the court was correct to deny Gregory Imbruce’s application to vacate the award. “The defendants cannot demonstrate that the arbitrator’s conduct amounted either to evident partiality, misconduct or an excess of authority,” DiPentima wrote in an opinion supported by two other judges. The decision is the latest blow to Imbruce, who has been embroiled in a longstanding legal battle that also involves two town residents who had invested with him. Investors—including New Canaan’s Brad Higgins and the late Bill Mahoney, formerly a partner at Bridgewater—had put money into three funds run by Imbruce to invest in oil and gas assets in Texas and Oklahoma.