ENTRENCHED

[adjective] [esp. disapproving]It's very difficult to change attitudes that have become so deeply entrenched over the years.It was an enormous struggle to overthrow such an entrenched dictator.The organization was often criticized for being too entrenched in its views.He's an entrenched conservative/left winger.(usually humorous) She sat entrenched behind an enormous pile of papers and didn't leave her desk all morning.