pathological

adjective4

1. •
   Pertaining to pathology.
2. •
   Relating to, amounting to, or caused by a physical or mental disorder.

   • Paul Canning's performance as Julian gives the character an emotional center that is not in the script: He is vulnerable without being pathological, needy without being pathetic. — 1981
3. •
   Having properties which are counterintuitive or difficult to handle.
4. •
   Having properties that cause unusually bad behaviour, especially regarding correctness or performance.