proper

Compared meaning: correct or appropriate (adjective).

比较义项：正确的、恰当的（形容词）。

• right

  The most general and common of the four; used loosely in everyday speech for anything correct or appropriate, without special emphasis on accuracy or formality.

  四者中最通用、最口语化的词；日常用语中泛指正确或恰当的事物，不特别强调准确性或正式程度。

  That is the right answer to this math problem.

  那是这道数学题的正确答案。

• correct

  Emphasizes factual accuracy and the absence of mistakes or errors; commonly used for answers, information, grammar, or data, and sounds more formal or technical than right.

  强调事实准确、没有错误；常用于答案、信息、语法或数据，语气比 right 更正式或专业。

  Please check that all the details in the form are correct.

  请检查表格中的所有细节是否正确。

• proper 本词

  Stresses conformity to accepted standards, rules, or social norms rather than mere accuracy; often implies correct procedure, manners, or decorum, and can sound somewhat formal.

  强调符合公认的标准、规则或社会规范，而非单纯的准确性；常暗示正确的程序或礼节，语气略正式。

  You should use the proper tools for this repair job.

  你应该用适当的工具来做这项维修工作。

• fitting

  Highlights that something matches or suits a particular situation, occasion, or context especially well; often used for actions, endings, or tributes, with a literary or formal tone.

  强调某事物与特定情境、场合十分相称；常用于描述行为、结局或致敬等，带有书面语或正式色彩。

  A quiet ceremony seemed like a fitting tribute to her.

  一场安静的仪式似乎是对她恰如其分的致敬。

Right, correct, proper, and fitting all mean correct or appropriate. Right is the most common, general word. Correct stresses accuracy. Proper stresses following accepted rules or manners, more formal. Fitting stresses matching an occasion, with a literary tone. Right's other sense is not compared here.

这四个词在“正确的/恰当的”这个意义上很接近，但语气和侧重点不同：right 最通用口语化，correct 强调事实准确无误，proper 强调符合规范或礼节、更正式，fitting 强调与特定场合相称、书面语色彩更浓。这里不比较 right 的“右方的”方向义，也不比较 correct 用作动词“纠正”的用法。