commonplace

Compared meaning: normal, not special (adjective).

比较义项：普通的，平常的，不特别（形容词）。

• everyday

  Mainly used before a noun to describe things that are a normal, expected part of daily life; emphasizes routine and frequency, and rarely stands alone after a linking verb.

  主要用在名词前，描述日常生活中平常、预期会出现的事物；强调习惯和频率，很少单独放在系动词后使用。

  This bag is designed for everyday use, not for special occasions.

  这个包是为日常使用设计的，而不是用于特殊场合。

• ordinary

  The most general and neutral term, simply meaning not special, unusual, or different; can describe people, days, or things, and works both before a noun and after a linking verb.

  是最普通、最中性的说法，仅表示不特别、不异常、没有差异；可以用来描述人、日子或事物，既能放在名词前，也能放在系动词后。

  The hotel room was perfectly ordinary, with nothing memorable about it.

  这家酒店的房间非常普通，没有什么让人印象深刻的地方。

• commonplace 本词

  More formal, often used with 'become' to say something that used to be rare or notable is now widespread and no longer surprising.

  语气更正式，常与“become”连用，表示某事物过去少见或引人注目，如今已变得普遍，不再令人惊讶。

  Online shopping has become so commonplace that few people visit malls anymore.

  网上购物已经变得如此普遍，以至于很少有人再去逛商场了。

• mundane

  Carries a negative or dismissive tone, describing tasks, routines, or a way of life that is boring and lacks excitement, rather than simply 'not special'.

  带有消极或轻视的语气，形容任务、日常事务或生活方式枯燥乏味、缺乏刺激，而不只是“不特别”。

  Filing paperwork all day felt mundane compared to her exciting old job.

  整天做文件归档工作让她觉得枯燥乏味，比起以前那份令人兴奋的工作。

Everyday, ordinary, commonplace, and mundane all mean not special. Everyday usually goes before a noun, stressing daily routine. Ordinary is the most general, neutral word. Commonplace is more formal, often with 'become', for things now widespread. Mundane sounds negative, describing boring, unexciting tasks.

这四个词在“普通、不特别”这一意义上很接近，但语气和用法不同：everyday强调日常习惯，常放在名词前；ordinary最中性、适用范围最广；commonplace书面语气更浓，常表示“由少见变为普遍”；mundane则带有枯燥乏味的负面色彩。