Many people know facts like "peanuts are legumes", "alcohol is a drug" or "chicken nuggets are made of animal flesh". However, some merely recognize these as facts that are true by definition, but seem to not be fully committed to their truth or grasp the consequences. Its like they didn't adopt the fact fully into their actual belief systems. They tend to keep acting like these facts are not true even though they consider them to be true.

I think this may be related to cognitive dissonance.

Are there philosophical terms to describe this phenomenon or is this merely a matter of psychology?