Triathlon Australia chief executive Anne Gripper, a key figure in the Lance Armstrong doping saga, has derided him as far worse than a drug cheat.
Armstrong wants to return to sanctioned triathlons and marathons, but Gripper hopes that will not happen.
She also doubts the 41-year-old will be able to return in the short term by negotiating a substantial reduction to his life ban.
Her opinions on the Armstrong saga and its fallout are particularly significant, because she set up the anti-doping unit at cycling's world governing body in the wake of the 2006 Operation Puerto scandal.
She was running the unit at the UCI at the start of Armstrong's 2009-11 comeback before leaving in March 2010.
"If he was just a drug cheat, I always believe you should do a sanction and have the right to come back to the sport," Gripper said.
"He's not a drug cheat - he's a bully, he's a manipulator, he's been incredibly unfair to a whole lot of people and he's a dead-set liar.
"(He's) not a single, one-off liar, he's a pathological liar. I don't want those people in our sport."
Asked if she thought Armstrong might now be able to reduce his ban so he can return to triathlons in the next couple of years, Gripper replied: "I think he's got Buckley's (chance), really".
Armstrong was preparing to compete in last year's Hawaiian Ironman world championships when the findings from the US Anti-Doping Agency investigation ended that campaign.
Gripper believes Armstrong when he said he rode clean during his cycling comeback, saying there was nothing in his test results when she was at the UCI to suggest abnormal blood values.
But she remains curious why the US federal investigation into his doping abruptly ended in early 2011.