ˈhigh-speed adjective [only before noun]

1. designed to travel or operate very fast:
a high-speed train
high-speed computer/network/modem etc
high-speed Internet access

2. high-speed chase a situation when the police drive very fast to try to catch someone in a car

[TahlilGaran] Dictionary of Contemporary English ▲

fast moving or able to move quickly:
The cheetah is the fastest animal in the world.
a fast car
quick moving fast or doing something in a short time:
He was much quicker than I was over the first 100 metres.
Do I have time for a quick shower?
high-speed [only before noun] designed to travel or operate very quickly:
a high-speed train
high-speed Internet access
rapid especially written happening in a short period of time – used about changes, increases, improvements etc:
a rapid increase in the population
the rapid expansion of the firm’s business in the Middle East
a rapid decline in profits
swift written moving quickly or happening after only a short time:
The horses ran along the track at a swift trot.
He received a swift response to his letter.
brisk quick and energetic:
a brisk walk in the countryside
His manner was very brisk.
speedy [only before noun] happening after only a short time:
Everyone wishes you a speedy recovery.
a speedy resolution to the problem
hurried done more quickly that usual, because you do not have much time:
She ate a hurried breakfast in the cafe before catching her train.
We made a hurried departure.
hasty deciding or doing something very quickly, especially when this has bad results:
It was a hasty decision, which he later regretted.
Let’s not be too hasty.

[TahlilGaran] English Thesaurus ▲

quickly at a high speed or without taking much time:
The stream was flowing quite quickly.
They quickly became friends.
fast at a high speed – used especially when talking about how something moves:
You're driving too fast!
He ran home as fast as he could.
quick spoken quickly – used in exclamations or in comparatives:
Quick! There’s a mouse!
swiftly written quickly:
The government acted swiftly.
She was surprised that he agreed so swiftly.
rapidly quickly – used especially about changes, increases, improvements etc:
The population is growing rapidly.
a rapidly changing world
speedily quickly and therefore efficiently:
All problems were speedily dealt with.
briskly quickly and energetically:
He walked briskly back along the path.
at high/great speed at a very fast speed – used especially in technical descriptions:
The molecules are travelling at great speed.
at a rapid rate especially written quickly – used about changes, increases, improvements etc:
Internet shopping is growing at a rapid rate.
as quick as a flash/in a flash extremely quickly:
As quick as a flash, I was back in my bed and under the covers.
like lightning moving extremely quickly:
Like lightning, the cat darted under the bushes.
flat out especially British English at the fastest speed possible:
The car was going flat out.
He was running flat out.
high-speed [only before noun] designed to travel or operate very quickly:
a high-speed train
high-speed Internet access
rapid especially written happening in a short period of time – used about changes, increases, improvements etc:
a rapid increase in the population
the rapid expansion of the firm’s business in the Middle East
a rapid decline in profits
swift written moving quickly or happening after only a short time:
The horses ran along the track at a swift trot.
He received a swift response to his letter.
brisk quick and energetic:
a brisk walk in the countryside
His manner was very brisk.
speedy [only before noun] happening after only a short time:
Everyone wishes you a speedy recovery.
a speedy resolution to the problem
hurried done more quickly that usual, because you do not have much time:
She ate a hurried breakfast in the cafe before catching her train.
We made a hurried departure.
hasty deciding or doing something very quickly, especially when this has bad results:
It was a hasty decision, which he later regretted.
Let’s not be too hasty.
be on a diet to be eating less or different food than normal in order to become thinner:
No cake thanks – I’m on a diet.

[TahlilGaran] English Thesaurus ▲