Translation guide
The concept of moving or operating at a high rate of speed. In Japanese, this is commonly expressed with the noun 高速 (こうそく), often used in compounds like 高速道路 (expressway) or 高速バス (highway bus). For adverbial use ('at high speed'), 高速で is standard. Other options include 高速度 (less common) and idiomatic expressions like 猛スピード (breakneck speed).
Describing something that moves, operates, or happens at a high speed.
The most common and versatile term for 'high speed'. Used as a noun or in compounds. Often appears as 高速で (at high speed) or in terms like 高速道路 (expressway).
This train runs at high speed.
High-speed internet has become widespread.
Literally 'high speed', but less common than 高速. Often used in technical contexts or to emphasize the degree of speed.
Shoot with a high-speed camera.
Means 'tremendous speed' or 'breakneck speed'. Used for very fast movement, often with a sense of recklessness.
The car sped away at breakneck speed.
Adverbial form meaning 'at high speed'. This is the most natural way to say 'at high speed' in Japanese.
Process data at high speed.
Referring to vehicles or transport systems designed for high speed.
Describing fast data transmission, internet, or processing.
高速 is the standard term for 'high speed' in most contexts. 高速度 is more literal but less common; it appears in specific compounds like 高速度カメラ (high-speed camera). For general use, stick with 高速.
Do not translate 'high speed' as 高い速度 (takai sokudo). While grammatically possible, it sounds unnatural. Use 高速 or 高速度 instead.
Expressway, highway. The standard term for limited-access high-speed roads.
I went to Osaka using the expressway.
Go from Tokyo to Nagoya by highway bus.