instant

Compared meaning: happening right away (adjective).

比较义项：立即的（形容词）。

• immediate

  Neutral and common in requests, responses, and consequences; stresses there is no delay or gap in time, often in formal or business contexts.

  语气中性，常用于要求、回应和后果等场合；强调没有延迟或时间间隔，常见于正式或商务语境。

  The company issued an immediate refund after customers complained about the defect.

  顾客投诉后，公司立即办理了退款。

• instant 本词

  Emphasizes the speed or suddenness of the event, often used for feelings, reactions, or effects that happen in a flash, with a slightly more vivid or emphatic tone.

  强调事情发生的速度之快或突然性，常用于形容瞬间产生的感觉、反应或效果，语气比immediate更生动、更强调。

  There was an instant connection between them the first time they talked.

  他们第一次交谈时就产生了一种瞬间的默契。

Immediate and instant both mean something happens right away. Immediate is neutral and stresses there is no delay, often used for requests, responses, or consequences. Instant emphasizes speed and suddenness, almost happening in a flash, often with feelings or reactions, and can sound more dramatic.

两者都表示事情马上发生，但instant更强调发生速度之快、几乎是瞬间完成，常带一点戏剧性或强调效果；immediate更中性，强调紧接着发生、没有延迟，常用于要求、回应或后果等场合。这里不比较instant在“速溶的、即食的”（如instant coffee）这一义项。

Compared meaning: happening quickly, with little delay (adjective).

比较义项：快速、几乎没有耽搁的（adj.）。

• instant 本词

  Instant stresses that something happens with zero delay or waiting time, not physical speed; it is used for reactions, results or feelings appearing right away, not for describing how fast something moves.

  instant 强调事情发生时几乎没有延迟或等待时间，而不一定指移动速度快；它常用于描述反应、结果或情感的即刻出现，而不是用来描述某物移动得有多快。

  She felt an instant dislike for the rude waiter as soon as he spoke.

  服务员一开口说话就很粗鲁，她立刻就对他产生了反感。

• fast

  Fast is the most common, neutral word for high speed, used for anything that moves or happens quickly — people, vehicles, animals, actions — and it also works as an adverb.

  fast 是最常见、最中性的表示速度快的词，可以用来形容任何移动或发生得快的事物——人、交通工具、动物、动作，也可以作副词使用。

  The cheetah is the fastest land animal, reaching speeds most predators can't match.

  猎豹是陆地上速度最快的动物，奔跑速度是大多数捕食者都追不上的。

• express

  Express describes a service, transport or delivery deliberately made faster than the standard option, as in 'express train' or 'express delivery'; it rarely describes a person's own speed.

  express 指专门比普通方式更快的服务、运输或递送方式，例如“express train（快车）”或“express delivery（快递）”；它很少用来形容一个人本身的速度。

  The express train skips several stations, so it reaches downtown much faster than the local one.

  这趟快车会跳过好几个站，所以比普通车更快到达市中心。

• quick

  Quick highlights that something takes only a short time or happens without delay, often for brief actions like a glance, chat or snack, rather than sheer velocity.

  quick 强调事情只花费很短的时间，或没有拖延，常用于简短的动作，比如看一眼、聊几句或吃点东西，而不是强调速度本身有多快。

  Let's grab a quick coffee before the meeting starts.

  开会前我们先快速喝杯咖啡吧。

Instant, fast, express, and quick can mean fast. Instant means no waiting time, not speed. Fast is the most common word for speed. Express means a faster service, like an express train. Quick means a short, brief action. Express also means 'state feelings' (not compared).

这几个词都能表示“快”，但侧重点不同：instant 强调完全没有等待时间，而不一定是移动速度快；express 通常指专门加快的服务或运输方式；quick 强调用时短、动作简短；fast 则是最通用、最常见的说法。这里不比较 express 作动词表示“表达（感情、想法）”的用法，也不比较 fast 作动词表示“斋戒”以及作副词的用法。

Compared meaning: a very short moment of time (noun).

比较义项：瞬间，很短的时间（名词）。

• instant 本词

  The neutral, most common word for a very short period of time; it can be used freely in everyday phrases and also as a conjunction meaning as soon as, which wink cannot do.

  这是表示很短时间时最中性、最常用的词；可以自由用于日常表达，也可以作连词，表示“一……就……”，这一点是 wink 做不到的。

  The instant he heard the alarm, he jumped out of bed.

  他一听到警报声，就立刻跳下床。

• wink

  Used almost only in the fixed phrase in a wink, an informal and slightly old-fashioned way of saying something happens very quickly; unlike instant, it cannot function as a conjunction.

  几乎只用于固定短语“一眨眼间”，是一种比较口语化、略带旧式色彩的说法，表示事情发生得很快；和 instant 不同，它不能作连词使用。

  Grandma can peel a whole bag of potatoes in a wink.

  奶奶眨眼间就能削完一整袋土豆皮。

Instant and wink mean a very short time. Instant is the common, neutral word and can mean 'as soon as'. Wink is used only in 'in a wink', an old, informal phrase. Not compared: wink as closing one eye, or instant as an adjective.

这两个词在“很短的时间”这个意思上很接近，但用法不同：instant 是中性、最常用的说法，可以自由用于日常表达，也可以作连词，表示“一……就……”；wink 几乎只用于固定短语“一眨眼间”，语气比较口语化、略带旧式色彩，不能作连词使用。这里不比较 wink 表示“眨眼”这一动作的意义，也不比较 instant 作形容词表示“速食的、立即的”的用法。