Cool MateFast vs Quick vs Rapid vs Speedy
When to use each in English, with meaning, register, and examples.
Fast
Quick
Rapid
Speedy
| Fast | Quick | Rapid | Speedy | |
|---|---|---|---|---|
| Pronunciation | 🇬🇧 /["/fɑːst/"]/🇺🇸 /["/fæst/"]/ | 🇬🇧 /["/kwɪk/"]/🇺🇸 /["/kwɪk/"]/ | 🇬🇧 //ˈræp.ɪd//🇺🇸 //ˈræp.ɪd// | 🇬🇧 //ˈspiːdi//🇺🇸 //ˈspiːdi// |
| Meaning | Moving or happening quickly. | happening fast or in a short time | happening very quickly | moving or happening quickly |
| Example | She runs very fast when she is late for school. | She took a quick glance at the clock. | The rapid changes in technology are hard to keep up with. | The delivery service is known for its speedy arrival times. |
| Register | Neutral | Neutral | Neutral | Neutral |
| How common | Top 1,000 (very common) | Top 1,000 (very common) | Top 2,000 (common) | Top 3,000 (common) |
| CEFR level | A1 | A1 | B2 | - |
| Part of speech | adjective | adjective | adjective | |
| Collocations | be, seem, extremely, fairly, very, be, seem, extremely, fairly, very | be, seem, become, extremely, fairly, very, at, quick and easy, be, seem, become, extremely, fairly, very, at, quick and easy, be, seem, become, extremely, fairly, very, at, quick and easy | rapid response, rapid increase, rapid change | speedy delivery, speedy recovery, speedy service, speedy response |
| Antonyms | slow | slow, leisurely | slow, gradual, leisurely | slow, sluggish, lethargic |
| Common mistakes | 'Fast' is sometimes confused with 'quick' improperly., Learners often forget that 'fast' can be used for both time and physical speed., Some may incorrectly add 'ly' to make it an adverb (fastly). | Confused with 'fast' — while similar, 'quick' often implies a short duration., Using 'quicker' instead of 'more quick' — 'quick' forms a comparative like 'quicker'., Mixing up noun and adjective forms; remember 'quick' is an adjective. | Confusing with 'quick', which implies speed but may not denote the same urgency., Using 'rapid' in contexts where a slower pace is typical. | Confusing 'speedy' with 'fast' which are often interchangeable but 'speedy' can imply efficiency., Using 'speedy' for slow processes, which is incorrect., Forget to pair 'speedy' with a noun, leading to incomplete expressions. |
| Usage notes | Use 'fast' to describe speed, but be cautious when using it with 'to' (as in 'to fast', it means to not eat for a period of time). Appropriate in both written and spoken contexts. | Used to describe actions or things that happen with speed. Avoid using in very formal situations; instead, use 'rapid' or 'swift'. | Used to describe actions or changes that occur with speed. Suitable for both formal and informal contexts. | Use 'speedy' in contexts where quickness is praised. It's appropriate in both spoken and written English, but more common in informal settings. |
See it in real clips
Frequently asked questions: Fast vs Quick vs Rapid vs Speedy
What's the difference between Fast, Quick, Rapid, and Speedy?
Fast: Moving or happening quickly. Quick: happening fast or in a short time Rapid: happening very quickly Speedy: moving or happening quickly
Which is more advanced: Fast, Quick, Rapid, and Speedy?
Rapid is the highest level, at B2, on the CEFR scale.
Can you show an example of each?
Fast: She runs very fast when she is late for school. Quick: She took a quick glance at the clock. Rapid: The rapid changes in technology are hard to keep up with. Speedy: The delivery service is known for its speedy arrival times.
Can I use Fast, Quick, Rapid, and Speedy interchangeably?
Not always. Fast, Quick, Rapid, and Speedy are related and overlap in some contexts, but they differ in register, how common they are, and usage, so swapping one for another can change the meaning or tone. Check the differences above before substituting.