unaffected

Compared meaning: not artificial or pretended (adjective).

比较义项：天然的，不做作的（形容词）。

• natural

  The general, common word for 'not artificial'; used for foods, materials and other physical things, and also for a person's manner; neutral in register.

  常用、泛义的词，表示“非人工的”；既可指食物、材料等实物，也可指人的举止，语域中性。

  This juice is made from natural ingredients with no added sugar.

  这种果汁是用天然原料制成的，不含添加糖。

• unaffected 本词

  More formal and literary; used almost only about a person's manner, style or performance, stressing the absence of pretense; not used for physical substances like food.

  更正式、书面化；几乎只用于描述人的举止、风格或表演，强调没有矫揉造作；不用于描述食物等实物。

  He gave an unaffected performance, completely free of Hollywood polish.

  他的表演真挚自然，完全没有好莱坞式的刻意雕琢。

Both words mean not artificial or fake. Natural is common and neutral, used for foods, materials, and also for a person's manner. Unaffected is more formal and literary, used almost only for a person's manner or style, stressing there is no pretense.

这两个词在“不做作、天然”这一义项上意思相近，但用法不同：natural 用法更广，既可形容食物、材料等实物，也可形容人的举止，语域中性；unaffected 更正式、偏书面，几乎只用来形容人的举止、风格或表演，强调真诚自然、没有矫揉造作。这里不比较 unaffected 的“未受影响的”义项（如 unaffected by weather）。

Compared meaning: not affected by something (adjective).

比较义项：不受（某事物）影响的（形容词）。

• immune

  Immune emphasizes built-in resistance or protection, often used with 'to', suggesting something cannot affect you even if it tries; common with criticism, emotions, or diseases.

  immune强调内在的抵抗力或保护力，常与“to”连用，表示即使受到影响也不会起作用，常用于批评、情绪或疾病等语境。

  Years of criticism have made her immune to negative comments from strangers.

  多年的批评已经让她对陌生人的负面评论完全免疫。

• untouched

  Untouched is more literal and vivid, suggesting something has not been touched, altered, or damaged at all, often describing places, objects, or traditions preserved intact.

  untouched更具字面性和画面感，表示某事物完全未被触碰、改变或损坏，常用来描述地方、物品或传统被完整保留。

  The old forest has remained untouched by loggers for over a century.

  这片古老的森林一个多世纪以来一直未被伐木者触碰。

• unaffected 本词

  Unaffected is more formal and neutral, simply stating that no change or influence occurred, commonly used with 'by' for measurable outcomes, situations, or emotions.

  unaffected语气更正式、中性，仅陈述没有发生变化或影响，常与“by”连用，用于描述可衡量的结果、状况或情绪。

  The company's profits were largely unaffected by the economic downturn.

  该公司的利润在很大程度上未受经济衰退的影响。

All three mean not affected by something. Immune stresses built-in resistance, often with 'to', suggesting something cannot affect you. Untouched is literal and vivid, meaning not touched or changed at all. Unaffected is formal and neutral, simply stating no change occurred, often with 'by'.

这三个词都表示“没有被某种事物影响或改变”，但语气和用法不同：immune强调天生或后天获得的抵抗力，untouched强调字面上未被触碰或改动，unaffected语气更正式中性，只是陈述没有产生变化。这里不比较unaffected表示“不做作、自然纯朴”（如unaffected manner）的义项，也不比较untouched表示食物“未被动过、未被食用”的义项，更不涉及immune在医学上“对某疾病具有免疫力”的专业用法（如immune system这一固定搭配）。