incessant

Compared meaning: happening again and again, without stopping (adjective).

比较义项：持续发生、不间断（形容词）。

• constant

  Constant describes something that happens again and again or is always present; it can refer to repeated separate occurrences, not necessarily one unbroken stretch, and is fairly neutral in tone.

  constant表示反复发生或一直存在的状态；它可以指多次分开发生的事情，不一定是连续不断的一段时间，语气比较中性。

  She received constant text messages from her sister during the trip.

  旅行途中，她不断收到妹妹发来的短信。

• uninterrupted

  Uninterrupted stresses that something continues in one unbroken stretch with no pause at all; it usually describes a single continuous period and often carries a positive or welcome tone.

  uninterrupted强调事情在一段连续不断的时间里进行，中间完全没有停顿；它通常描述单一的连续过程，语气偏正面或让人欣然接受。

  The team worked for six uninterrupted hours to finish the project before the deadline.

  团队连续工作了六个小时，中途没有停顿，赶在截止日期前完成了项目。

• incessant 本词

  Incessant means continuing or recurring without ever stopping, and almost always carries a negative tone of annoyance or exhaustion, often describing noise, complaints, or other irritating repeated actions.

  incessant表示持续或反复发生、从不停止，几乎总是带有厌烦或令人疲惫的负面语气，常用来形容噪音、抱怨等令人烦躁的反复动作。

  The incessant honking of car horns during rush hour made her tense with irritation.

  高峰时段汽车喇叭不停地鸣响，让她感到烦躁紧张。

Constant, uninterrupted, and incessant all describe something that keeps happening or continuing. Constant is neutral, describing things that happen repeatedly or are present. Uninterrupted stresses one unbroken stretch with no pause, often sounding positive. Incessant means continuing without ever stopping, and almost always sounds negative.

这三个词都可以形容事情反复或持续发生，但语气和侧重不同：constant语气中性，强调反复发生或一直存在；uninterrupted强调完全没有停顿的连续状态，语气偏正面；incessant语气较重，常带厌烦、恼人的负面色彩。这里不比较constant表示「不变的、恒定不变」的意思，如恒定的速度（constant speed）。