There’s also more informal types of definitions of “pathological” you could use.
Perhaps the Pathological Gambler.
This is the guy or gal who is completely obsessed with any form of gambling.
Slots, tables, lottery, betting you name it they are pathologically addicted or compulsively addicted.
The ruin their entire life and the lives of close family members as they watch them destroy their lives
because of the uncontrollable addiction or compulsion to pathologically gamble away everything and beyond.