Quick vs Fast: What's the Difference? | Speed Words Explained - 常规

'Quick' and 'fast' both describe something that happens or moves rapidly, but there are subtle differences in their meanings.

Usage: 'Fast' is more common and can be used for various speeds, including objects moving, people reacting, and vehicles traveling. 'Quick' is typically used for people or actions, especially when completing tasks or actions in a short time.
Duration: 'Fast' emphasizes the speed's persistence, maintaining rapidness over a longer period. 'Quick' highlights the speed's instantaneousness, completing an action or task in a brief moment.
Tone: 'Fast' is more neutral, describing speed without strong emotional connotations. 'Quick' carries a positive, agile, and nimble connotation, often used for praise or admiration.

For example:

He can run very fast. (He is very fast at running.)
He has quick reflexes. (He is quick to react.)
The car was fast, but the race was over in a quick finish. (The car was fast, but the race ended quickly.)
She quickly solved the math problem. (She solved the math problem rapidly.)