1 : having narrow interests, sympathies, or outlook. 2 : typical of a small-minded person : marked by pettiness, narrowness, or meanness small-minded conduct.

What do you call small-minded people?

biased. bigoted. conservative. illiberal.

Why are some people small-minded?

Rigidity—which is associated with narrow-mindedness—is a symptom of some mental illnesses. For example, some personality disorders might cause a person to behave in narrow-minded ways. Someone who has social anxiety disorder might seem narrow-minded about going out to parties or different social venues.