happening or done quickly and immediately:
My letter received a swift reply.
She shot a swift glance at Paul.
swift to do something
They were swift to deny the accusations.
2 [only before noun]
moving, or able to move, very fast:
a swift runner
She wiped her tears away in one swift movement.
3 American English spoken
used to say that someone is not very intelligent
Alice dressed swiftly.
—swiftness noun [uncountable]WORD FOCUS: fast
moving very quickly: at high speed, like lightning, at top speed, flat out
doing something quickly: quick, rapid, swift, prompt, speedy
happening quickly: rapid, speedy, meteoric, at an alarming rate, in no time
➔ See also fast