She had that inbred politeness, it was a part of her.

她拥有那种天生的优雅，举手投足都彬彬有礼。

...behaviour patterns that are inbred.

与生俱来的行为模式

The whole population is so inbred that no genetic differences remain.

整个族群都是同系繁殖，以至于根本不存在基因差异。

He came from an old inbred family.

他来自一个古老的近亲通婚的家族。