"impressively rapid" is correct and can be used in written English.
You can use it when you are talking about something that happened quickly or quickly achieved a goal. For example, "The development team completed the project impressively rapid."
But it is also impressively rapid, with an insistent rush of thrust right through the engine's speed range and a deep, enthusiastic exhaust note.
"People feel that the journalists are maybe the pawns in some larger game but it's not clear what that might be yet," says Catherine McKinley, a media analyst in Hanoi.The Communist Party, like its Chinese counterpart, seems to have won the people's grudging acceptance for having delivered impressively rapid economic development since ditching collectivism over 20 years ago.
Computer simulations have experienced impressively rapid development in the past decade.
Tophus debulking is impressively rapid (months) in responders, but uricase therapies tested to date have all been substantially limited by drug immunogenicity.
His elaborate fulminations are impressively rapid-fire but also excessive.
So it's an impressively speedy rise.
This is impressively documented by the rapid spread of P-elements in the Drosophila genus (reviewer's refs. 8 10).
The Pilbara is impressively arid, empty country.
The T6SS is an impressively effective weapon against competitor bacteria, with a rapid rate of discharge of its deadly cargo into adjacent cells.
More impressively, (Izadi et al. 2011) showed that the rapid and detailed reconstruction of building indoor scenes can be achieved; however, their work is currently limited to the reconstruction of a relatively small building scene (3 m cube) (Roth and Vona 2012).
understand improv's limitations and have created an impressively structured show that calls upon its most immediate pleasures: rapid-fire comedy with strong handles, and the space for giddy failure.
