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Definitions

high-speed

[hahy-speed] / ˈhaɪˈspid /
ADJECTIVE
breakneck
Synonyms
STRONGEST
headlong rapid
WEAK
at full tilt dangerously fast excessive flat out lightning precipitate reckless speedy whirlwind
Antonyms
WEAK
extremely slow
ADJECTIVE
express
Synonyms
STRONG
accelerated fast nonstop quick rapid swift
WEAK
velocious
Antonyms
STRONG
slow sluggish
WEAK
imprecise indefinite indirect obscure uncertain vague
ADJECTIVE
jazzed-up
Synonyms
WEAK
gassed-up high geared high performance hopped-up pepped-up pumped-up revved-up speedy supercharged

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

Judge Buchanan said everyone recognised the impact of Buchan's actions and his "disgracefully" high speed.

From BBC • Apr. 15, 2026

“No other country has gone to such lengths on high speed and high voltage,” Ma writes.

From Barron's • Apr. 14, 2026

These shifts are not flaws but a normal and necessary part of running at high speed.

From Science Daily • Apr. 8, 2026

The worst incident involved a near-miss when Alpine driver Franco Colapinto narrowly avoided smashing at high speed into the back of the slow-moving Racing Bull of Liam Lawson.

From BBC • Mar. 12, 2026

It was Richard Parker and he was coming my way at high speed.

From "Life of Pi" by Yann Martel