This is the 8833rd most frequent Japanese word.
根づい
"根づい" (nezui) means "rooted" or "firmly established."
The term '根づい' (used here as '根づいている') metaphorically conveys the concept of traditions being firmly established or enduring within a place or culture.
この地域では古い伝統が深く根づいている。
In this region, old traditions are deeply rooted.
Here, '根づい' (used as '根づいている') figuratively describes the lasting influence or presence of prejudices in someone's thinking.
彼の考え方には社会の偏見が根づいている。
His way of thinking is rooted in societal prejudices.
In this case, '根づい' (used as '根づいてきた') illustrates the progressive adoption or integration of concerned values or principles within a group.