Proper is an English adjective with multiple meanings:
1. Correct or suitable for a particular purpose or situation
2. Real, satisfactory, suitable, or correct
3. Showing standards of behavior that are socially and morally acceptable
4. (British English) Complete
5. Belonging to the main or most important part of something
6. (Grammar) Referring to a noun that names a particular person, place, or thing
proper这个词儿可有意思了，咱们来掰扯掰扯：
1. 最常用的意思就是"合适的、恰当的"，比如说："This isn't the proper way to do it"翻译过来就是"这么整不太对劲儿"
2. 还可以表示"真正的、像样的"，比如："After hours of searching, we finally found a proper restaurant"可以翻译成"找了大半天儿，总算找着个像样的馆子"
3. 指"合乎规矩的、体面的"，比如："She's a very proper young lady"可以翻译成"这姑娘可讲究了"
4. 英式英语里还能表示"完全的、彻底的"，比如："We were in a proper mess"翻译成"简直乱成一锅粥了"
5. 表示"主要的、核心的"，比如："the proper meaning of the word"就是"这个词儿最核心的意思"
6. 语法里指"专有的"，比如"proper noun"就是"专有名词"
补充说明：这个词儿在口语里经常带点儿调侃的意思，比如说"proper gentleman"可能是在夸人，也可能是在说这人太端着，得看语境儿。