忙しい形容詞 busy 忙しい、慌ただしい、忙しげな engaged 忙しい、忙しない occupied 忙しい、占領下の、忙しない 忙しさ名詞 hum 働き、多忙、忙しさ、忙中 busyness 働き、多忙、忙しさ、忙中