insidious

Compared meaning: causing harm or damage (adjective).

比较义项：造成伤害或损害（形容词）。

• harmful

  The most general, neutral word for something that can hurt health, people, or things; used broadly in everyday and scientific contexts.

  语气最中性、最常用的词，指对健康、人或事物造成伤害，广泛用于日常和科学语境中。

  Fried food eaten every day can be harmful to your heart.

  每天吃油炸食品可能对心脏有害。

• catastrophic

  Describes harm that is extremely severe, sudden, and disastrous in scale, far stronger than ordinary harm.

  指极其严重、突然且往往具有灾难性规模的伤害，程度远强于一般的伤害。

  The earthquake had a catastrophic effect on the small coastal town.

  这场地震给这个小海滨城镇带来了灾难性的影响。

• detrimental

  A more formal synonym for harmful, typically paired with abstract nouns like health, interests, or development, mainly in written or academic style.

  是harmful的更正式说法，通常与健康、利益或发展等抽象名词搭配，多用于书面或学术语体。

  Skipping breakfast regularly can be detrimental to a child's concentration in class.

  经常不吃早餐可能有损孩子在课堂上的专注力。

• insidious 本词

  Describes harm that develops gradually and secretly, without obvious warning signs, making it especially dangerous.

  指伤害以渐进、隐蔽的方式发展，没有明显的预警迹象，因而格外危险。

  Stress can have an insidious effect on your health, building up quietly for years.

  压力可能对健康产生潜移默化的伤害，多年来悄悄累积。

All four describe causing harm, but differ in strength and style. Harmful is the most common and neutral. Detrimental is more formal, often paired with words like health or interests. Catastrophic describes the most severe, sudden, disastrous harm. Insidious describes harm that develops slowly, secretly.

这四个词都表示造成伤害或损害，但语气强度和使用方式不同：harmful最常用、程度适中；detrimental更正式，常与抽象名词搭配；catastrophic程度最强，指突发的灾难性后果；insidious强调伤害以隐蔽、渐进的方式发生。此处不涉及这些词可能有的其他用法或引申义。