成人の日 せいじんのひ Meanings Expression, Noun Coming of Age Day (national holiday; second Monday in January); Adult's Day Kanji 成 become. Read as セイ. 人 person. Read as ジン. 日 day. Read as ひ. Example sentences 私は成人の日に人々の色とりどりの着物を見るのが好きです。I love looking at everyone's colorful kimonos on Coming of Age Day. 成人の日は、みんなが着てる色鮮やかな着物を眺めるのが大好きなんです。I love looking at everyone's colorful kimonos on Coming of Age Day. Jinuma: Japanese Dictionary · Word lists