maladaptive

adjective2

1. •
   Of behavior, showing inadequate or counterproductive mental and behavioral adaptation to a new situation.

   • An individual's functioning can be conceptualized on a continuum, with one end being more adaptive and healthy and the other end being more maladaptive and less healthy. — 2013
2. •
   Of anatomy, physiology, or behavior, showing inadequate or counterproductive evolutionary adaptation to an environment or its changes.