crazed

Compared meaning: mentally ill or acting irrationally (adjective).

比较义项：形容人精神失常、极度不理智或情绪失控（adj.）。

• crazy

  The most common, informal word for being mentally ill or acting irrationally; general and non-clinical, often used casually about ordinary people, not in legal or medical contexts.

  最常用、最口语化的词，指精神失常或行为不理智；泛指、不专业，常用来随口形容普通人，而不用于法律或医学语境。

  My grandfather started acting crazy after the accident, forgetting where he was.

  我爷爷出事故后开始变得神志不清，忘记自己身在何处。

• paranoid

  Describes a narrower symptom: unreasonable suspicion or fear that others intend harm, not general madness or wild behavior.

  指更具体的症状：毫无根据地怀疑或害怕别人要加害自己，而不是泛指发疯或行为狂暴。

  After the break-in, she became paranoid and started checking every window twice a night.

  遭遇入室盗窃后，她变得疑神疑鬼，每晚都要把每扇窗户检查两遍。

• insane

  A stronger and more formal word than crazy, used for serious mental illness, especially in legal or medical settings such as court rulings or hospital diagnoses.

  比 crazy 语气更重、更正式，用于严重的精神疾病，尤其常见于法庭判决或医院诊断等法律、医学语境。

  The judge ruled that the killer was legally insane at the time of the crime.

  法官裁定凶手作案时在法律意义上属于精神失常。

• crazed 本词

  Emphasizes wild, out-of-control behavior in the moment rather than a mental state; almost always placed directly before a noun, as in a crazed fan or a crazed gunman.

  强调当下狂暴、失控的行为，而非精神状态本身，几乎总是直接修饰名词，例如疯狂的粉丝或发疯的持枪歹徒。

  A crazed gunman stormed into the building, shooting wildly in every direction.

  一名情绪失控的持枪者冲进大楼，朝四面八方疯狂开枪。

Crazy, paranoid, insane and crazed describe people acting irrationally. Crazy is the most common, informal word. Paranoid means unreasonable suspicion or fear of others. Insane is stronger, more formal, used in legal or medical settings. Crazed describes wild behavior, placed before a noun.

这几个词都可以形容人精神失常或行为异常，但语气和侧重点不同：crazy 最口语化，程度较轻，泛指不理智的言行；insane 更正式、程度更重，常见于法律或医学语境；paranoid 只针对毫无根据的猜疑和恐惧，并非泛指精神失常；crazed 强调一时情绪失控、行为狂暴，几乎只用来修饰名词。这里不比较 crazy 表示「荒谬的，令人难以置信的」（如 a crazy idea）或 insane 表示「极好的，惊人的」（如 insane talent）等口语引申义。