abrupt

Compared meaning: happening suddenly and unexpectedly (adjective).

比较义项：突然发生、出乎意料的（形容词）。

• sudden

  A general, neutral word for something happening quickly and without warning; it can describe almost any event, decision, or feeling, with no hint about size or tone.

  语气中性、用途最广的词，泛指快速且毫无预兆发生的事情，可用于几乎任何事件、决定或感受，不暗示变化的幅度或语气。

  Their sudden decision to move abroad surprised the entire family.

  他们突然决定移居国外，让全家人都感到惊讶。

• sharp

  Stresses a sudden change that is also large or marked in degree, typically used with measurable things like prices, temperature, turns, or pain; rarely used for decisions or events themselves.

  强调变化不仅突然，而且幅度明显，常用于价格、温度、转弯、疼痛等可衡量的事物，很少直接修饰决定或事件本身。

  There was a sharp rise in oil prices after the news broke.

  消息传出后，油价出现了急剧上涨。

• abrupt 本词

  Sudden and unexpected, but often carries a negative tone of being curt, rude, or jarring, especially describing the manner of speech, an ending, or a physical turn.

  同样表示突然、出乎意料，但常带有生硬、无礼或令人不适的负面语气，尤其用来形容说话方式、事情的结束或急转的动作。

  His reply was so abrupt that it felt almost rude.

  他的回答如此生硬突然，几乎显得有些无礼。

Sudden, sharp, and abrupt all mean happening suddenly and unexpectedly, but with different tones. Sudden is the most neutral, general word. Sharp stresses a big change in degree. Abrupt often sounds rude or unpleasant. This does not cover sharp meaning to cut, like a knife.

这三个词都表示「突然、出乎意料」，但语气和用法不同：sudden 最中性通用，sharp 强调变化幅度大，abrupt 常带生硬或无礼的意味。这里不比较 sharp 表示「锋利的」的意思（如 sharp knife）。

Compared meaning: rude and short in speech or manner (adjective).

比较义项：说话或态度粗鲁、生硬、无礼简短（形容词）。

• abrupt 本词

  Abrupt highlights suddenness as much as rudeness, and can describe any sudden change — a stop, an ending, a shift in topic — not only speech, unlike curt, which is limited to tone or replies.

  abrupt强调的是突然，和粗鲁一样重要，它可以形容任何突然的变化——停止、结束、话题转换——而不仅限于言语，这一点与只能用于语气或答话的curt不同。

  The meeting came to an abrupt halt when the fire alarm went off.

  当火警警报响起时，会议戛然而止。

• curt

  Curt describes a deliberately short, unfriendly way of speaking — a reply, tone, or note — implying the speaker is being dismissive, not simply sudden.

  curt形容的是故意简短、不友好的说话方式——如回答、语气或便条——暗示说话人是有意表现冷淡，而不仅仅是突然。

  The receptionist gave a curt reply and hung up the phone.

  接待员生硬地回了一句，就把电话挂了。

Abrupt and curt both describe rude, short speech or manner. Abrupt stresses suddenness, and besides speech can also describe an action or change stopping suddenly. Curt refers only to speech or tone that is deliberately short and cold.

这两个词都形容粗鲁而简短的言语或态度，很容易混淆；abrupt强调突然、出乎意料，除了言语外还可以形容动作或变化的骤然停止；curt则专指说话或语气上故意简短、冷淡，通常只用于言语场合。