He was overwhelmed by their friendly informality.

他们的友好随和令他受宠若惊。

a sign that more informality is gradually coming into the language.

更多非正式元素正在融入这种语言的迹象。

She enjoyed the relative informality of island life.

她喜欢岛上比较轻松随意的生活。

the informality of the communication process.

交流过程的随意性。