unimportant

Compared meaning: small and not worth attention or care (adjective).

比较义项：琐碎的；不重要的（形容词）。

• petty

  Petty suggests something is not just small but beneath serious attention, often carrying a hint of disapproval, as when describing mean-spirited behavior or a minor dispute.

  petty 不仅表示事情小，还常带贬义，暗示不值得认真对待，例如用来形容小气、斤斤计较的行为或琐碎的争执。

  Refusing to split the bill over a single dollar was petty of him.

  因为一美元就不肯平摊账单，他这样做未免太小气了。

• trivial

  Trivial often implies something is of little consequence or effort, especially in technical or intellectual contexts, without petty's disapproving tone.

  trivial 常表示某事影响很小或很容易处理，尤其常用于技术或学术语境，没有 petty 那种带贬义的语气。

  The bug was trivial to fix and took less than a minute.

  这个程序错误很容易修复，不到一分钟就搞定了。

• unimportant 本词

  Unimportant is the plainest and most general term, simply stating that something lacks significance, without petty's disapproving edge or trivial's sense of ease.

  unimportant 是最平实、最通用的说法，只是单纯陈述某事不重要，没有 petty 的贬义色彩，也没有 trivial 那种“容易处理”的含义。

  In the end, whether you win or lose is unimportant; what really matters is trying.

  说到底，输赢并不重要，重要的是尽力去做。

All three mean not important. Petty also sounds disapproving, like a mean-spirited dispute. Trivial is neutral, meaning small in effect. Unimportant is the plainest word, just meaning insignificant. Petty can also mean a small amount of money; that sense is not compared here.

这些词都表示“不重要，不值得关心”，但语气和使用场合不同：petty 除了表示“琐碎”还常带贬义，暗示小气、斤斤计较；trivial 语气中性，常用于描述影响很小或很容易处理的事情；unimportant 是最平实、最通用的说法，只是单纯陈述“不重要”。这里不比较 petty 的“（金额）小额的”等其他义项，例如 petty cash（零用钱）。