Definition of pathological | Bee Dictionary of English

a of or relating to the practice of pathology
pathological laboratory
s caused by or evidencing a mentally disturbed condition
a pathological liar
a pathological urge to succeed
s caused by or altered by or manifesting disease or pathology
pathological bodily processes

Diplomats, natural performers and pathological liars are often impossible to read.
For some people, Gentile adds, pathological gaming can be a telling sign of underlying conditions like depression or obsessive-compulsive disorder.
You remember Jack Kevorkian, the pathological pathologist who, when he wasn't transfusing blood from corpses, refining his "mercitron" machine or arguing for an auction market for .

Defense suggests slain Rockland mom's son may have faked evidence
Defense attorneys grilled the son of slain Rockland mother Tina Gonsalves for nearly three hours in cross-examination on Tuesday, calling Aaron Dorsett a “pathological liar” and suggesting he may have faked evidence to make it look like someone had broken into the family’s apartment.
June 11, 2013 - Rockland Standard
Research and Markets: Coagulation Self-Testing Devices, Markets, Players and Prospects
DUBLIN--(BUSINESS WIRE)--Research and Markets (http://www.researchandmarkets.com/research/h7wtkn/coagulation) has announced the addition of the "Coagulation Self-Testing Devices, Markets, Players and Prospects" report to their offering. The ability of patients to self-monitor is deemed to be a critical tool in reducing the pathological effects of difficult-to-control disease factors. For the ...
June 11, 2013 - Business Wire
How about the truth?
The May 25 letter Congress vs. the American people sums up what has been going on in Washington since the Republicans couldn’t accomplish their oft-stated goal of making President Obama a one-term president. All we see are right-wing politicians, blinders securely on, doing anything but the people’s business in their pathological drive to bring Obama down.
June 10, 2013 - Miami Herald

David Cameron in guardian.co.uk
Cameron describes this as a "pathological inability to recognise that marriage is a good thing".
Silvio Berlusconi in BBC News
The mafia is a pathological phenomenon that we want to defeat once and for all by the end of this term in office,Mr Berlusconi told Italy's national radio. "No government in the history of the republic has acted with as much determination...
Jamie Glazov in Sydney Morning Herald
Glazov writes that in many Islamic societies, "women are supposed to dehumanise themselves in order to be tolerated : Women are considered to be the incarnation of shahwa [desire] which comes from the devil. In this environment the pathological...