informal

US /ɪnˈfɔːr.məl/
UK /ɪnˈfɔːr.məl/
"informal" picture
1.

非正式的, 随意的, 不拘礼节的

having a relaxed, friendly, or unofficial style or manner

:
The meeting had an informal atmosphere.
会议气氛很随意
She prefers to wear informal clothes on weekends.
她周末喜欢穿休闲的衣服。
2.

非正式的, 不合规范的

not according to strict rules or forms

:
The group has an informal agreement to meet every month.
该团体有一个每月会面的非正式协议。
The language used in text messages is often very informal.
短信中使用的语言通常非常非正式