速さ・早さ|はやさhayasa
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Which spelling to use
速さ速さ（はやさ） is the more common written form and the recommended choice for beginners; use it as the default when writing the word.
早さ早さ（はやさ） is a less common written form of the same word; beginners should generally choose 速さ（はやさ） instead.
Definitions
- nounspeed; velocity; quickness; rapidityesp. 速さ
- nounearlinessesp. 早さ
Synonyms & antonyms
- Synonym速度そくどNeutralNeutral. Physical speed, including direction as a vector; suits written, objective contexts, while 「速さ」 is the everyday word for degree of fastness.
- SynonymスピードCasualColloquial. A loanword for speed, very common in speech; 「速さ」 is the native Japanese word.
- Synonym速力そくりょくWrittenWritten/formal prose. Refers to the speed of vehicles such as cars and ships; 「速さ」 is more everyday.
- SynonymペースNeutralNeutral. A loanword for the pace or rhythm of movement and work, as in 「マイペース」; 「速さ」 focuses on fastness itself.
- Antonym遅さNeutralNeutral. The degree of being slow or late, as in 「足の遅さ」; the direct opposite of 「速さ」.
Use 「速さ」 for everyday degree of fastness, as in 「足の速さ」. For physical speed pick 「速度」, in casual speech 「スピード」, for the speed of cars and ships 「速力」, and for pace or rhythm 「ペース」; the opposite is 「遅さ」.
Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only
Japanese definitions
Kanji in this word
English equivalents
See also
