かいそく 快速 Common word Wanikani level 30 Play audio LinksSentence search for 快速Sentence search for かいそくKanji details for 快 and 速Edit in JMdict Noun, Noun which may take the genitive case particle 'no'1. high speed; rapidityNoun2. rapid-service train (not as fast as express); rapid trainAbbreviation, See also 快速電車 Discussions Log in to talk about this word.