Cool MateFast vs Hasty vs Quick vs Rapid
When to use each in English, with meaning, register, and examples.
Fast
Hasty
Quick
Rapid
| Fast | Hasty | Quick | Rapid | |
|---|---|---|---|---|
| Pronunciation | 🇬🇧 /["/fɑːst/"]/🇺🇸 /["/fæst/"]/ | 🇬🇧 //ˈheɪ sti//🇺🇸 //ˈheɪsti// | 🇬🇧 /["/kwɪk/"]/🇺🇸 /["/kwɪk/"]/ | 🇬🇧 //ˈræp.ɪd//🇺🇸 //ˈræp.ɪd// |
| Meaning | Moving or happening quickly. | Doing things quickly without thinking carefully. | happening fast or in a short time | happening very quickly |
| Example | She runs very fast when she is late for school. | His hasty decision led to unexpected consequences. | She took a quick glance at the clock. | The rapid changes in technology are hard to keep up with. |
| Register | Neutral | Neutral | Neutral | Neutral |
| How common | Top 1,000 (very common) | Top 5,000 (fairly common) | Top 1,000 (very common) | Top 2,000 (common) |
| CEFR level | A1 | B1 | A1 | B2 |
| Part of speech | adjective | adjective | adjective | adjective |
| Collocations | be, seem, extremely, fairly, very, be, seem, extremely, fairly, very | hasty decision, hasty retreat, hasty judgment | 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 |
| Antonyms | slow | slow, careful, deliberate | slow, leisurely | slow, gradual, leisurely |
| 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). | Confusing 'hasty' with 'hasty decision', thinking it applies only to choices., Using 'hasty' as a noun or verb instead of an adjective., Forgetting that 'hasty' implies negative connotations. | 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. |
| 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. | Use 'hasty' to describe actions taken too quickly, often leading to mistakes. It's suitable for both formal and informal contexts. Avoid using it in overly casual conversations. | 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. |
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Frequently asked questions: Fast vs Hasty vs Quick vs Rapid
What's the difference between Fast, Hasty, Quick, and Rapid?
Fast: Moving or happening quickly. Hasty: Doing things quickly without thinking carefully. Quick: happening fast or in a short time Rapid: happening very quickly
Which is more advanced: Fast, Hasty, Quick, and Rapid?
Rapid is the highest level, at B2, on the CEFR scale.
Are Fast, Hasty, Quick, and Rapid the same CEFR level?
Fast: A1, Hasty: B1, Quick: A1, Rapid: B2 on the CEFR scale.
What part of speech are Fast, Hasty, Quick, and Rapid?
Fast: adjective, Hasty: adjective, Quick: adjective, Rapid: adjective.
Can you show an example of each?
Fast: She runs very fast when she is late for school. Hasty: His hasty decision led to unexpected consequences. Quick: She took a quick glance at the clock. Rapid: The rapid changes in technology are hard to keep up with.
Can I use Fast, Hasty, Quick, and Rapid interchangeably?
Not always. Fast, Hasty, Quick, and Rapid 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.