unaware

Compared meaning: not noticing something or some situation (adjective).

比较义项：未察觉到某事/某种情况（形容词）。

• unconscious

  Formal, mostly used as 'unconscious of' + noun; describes not noticing something subtle, such as an effect, feeling or influence, often about oneself. Rarely used with 'that' clauses or about outside danger.

  较为正式、带文学色彩，常用「unconscious of + 名词」的结构，表示没有察觉到某种微妙的影响、感受，且多用于谈论自身；很少用「that」从句，也不用于外部危险。

  She seemed unconscious of the impression her sharp remarks left on the room.

  她似乎没有意识到自己尖刻的话给全场留下了什么印象。

• oblivious

  Common and informal; typically 'oblivious to/of' + noun, describing someone so absorbed or distracted that they fail to notice their surroundings or an obvious fact.

  常见且口语化，通常用「oblivious to/of + 名词」，形容一个人因专注或分心而没有注意到周围环境或某个明显的事实。

  He walked past his old friend, completely oblivious to her waving from across the street.

  他从老朋友身边走过，完全没注意到她正在马路对面向他挥手。

• unaware 本词

  The plain, neutral choice; works with 'that' clauses or 'of' + noun, simply stating a lack of knowledge or awareness without implying any particular cause.

  最平实、中性的说法，可接「that」从句或「of + 名词」，只是单纯陈述缺乏了解或察觉，不暗示任何特定原因。

  I was unaware that the meeting had been moved to a different room.

  我没有意识到会议已经改到了另一个房间。

• unsuspecting

  Implies vulnerability to danger, harm or deception; almost always describes the noun it modifies (an unsuspecting victim, tourist, buyer) rather than following a linking verb.

  暗示容易受到危险、伤害或欺骗；几乎总是用来修饰名词（如 unsuspecting victim/tourist/buyer），而不是跟在系动词后面。

  A con artist can easily deceive an unsuspecting shopper with a fake charity collection.

  骗子很容易用假的慈善募捐骗过毫无戒心的顾客。

All four mean not aware of something, but differ. Unconscious is formal, for not noticing an effect or feeling. Oblivious means not noticing surroundings due to distraction. Unaware is the plain, neutral choice. Unsuspecting means unaware of danger or deception, almost always modifying a noun.

这四个词都表示「没有察觉到某事」，但语气和用法不同：unconscious 较为正式、文学化，常用于表达没有意识到自身的某种影响或感受；oblivious 强调因专注或分心而没注意到周围情况；unaware 是最中性、最常用的说法；unsuspecting 特指没有察觉到危险或欺骗，几乎只用来修饰名词。这里不比较 unconscious 表示「失去知觉的、昏迷的」这一义项。