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he is so fast vs he is so quick

Both 'he is so fast' and 'he is so quick' are correct English phrases. They're interchangeable and can be used to describe someone's speed. The choice between 'fast' and 'quick' is just a matter of personal preference or style, as they have similar meanings in this context.
Miss E. profile picture

Explained by Miss E.
Editor at TextRanch

Last updated: March 09, 2025 • 6099 views

This phrase is correct and commonly used in English to describe someone's speed.

"he is so fast"

This phrase is used to describe someone who moves or performs tasks at a high speed.
  • Bruce Lee... he is so fast.
  • So slow when sending deliveries, but when he eats, he is so fast.
  • So where is he going so fast?
  • The problem is, he's so fast.
  • Why is he going so fast with his flashers off?
  • Nice work finding Quinn so fast.
  • My life is changing so fast.
  • Things between us happened so fast.
  • New York is very fashionable and fast, So fast you can't even stroll through it.
  • But sometimes, like today, we fall, we fall so fast, so fast to shadow, we fall so fast to barbaria.
  • I've never seen someone burn through money so fast.
  • Not so fast, my furry little friend.
  • All right, not so fast.
  • Other guys online come on so strong, so fast.
  • Lance smushed his letters together 'cause he wrote so fast.
  • Time is going by so fast.
  • It's crazy to jump into something so fast.
  • Mr. Wen, not so fast.
  • But everything just kind of moved so fast.
  • Big guy, maybe not moving so fast.

Alternatives:

  • he is very fast
  • he is extremely fast
  • he is incredibly fast
  • he is exceptionally fast
  • he is unbelievably fast

This phrase is correct and commonly used in English to describe someone's speed.

"he is so quick"

This phrase is used to describe someone who moves or performs tasks at a high speed.
  • Excuse me, English sometimes not so quick.
  • Don't be so quick to throw us away.
  • But the tidal gravity is so quick that... something crossing the horizon fast might survive.
  • I wish you didn't have to leave so quick.
  • Maybe you shouldn't have been so quick to sublet your place.
  • Don't be so quick with those hands.
  • He loved his cousin, and it was all so quick.
  • Thanks for making the trip so quick.
  • Don't rule it out so quick.
  • I'm sorry that was so quick.
  • But it vanishes so quick you wouldn't believe.
  • Happened so quick, I didn't really see anything.
  • Boys, we don't have to be so quick to...
  • You were so quick to suspect the wife.
  • So quick and easy, pretty boy.
  • People are so quick to misinterpret one's motives.
  • We were so quick to blame general Collins.
  • I wouldn't be so quick to dub Jack Porter a Saint.
  • Don't be so quick to run down the money.
  • Don't be so quick to judge me.

Alternatives:

  • he is very quick
  • he is extremely quick
  • he is incredibly quick
  • he is exceptionally quick
  • he is unbelievably quick

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