十年一日 じゅうねんいちじつ Also written じゅうねんいちにち Meanings Noun without intermission for ten (long) years; with constancy of purpose for ten (long) years; in the same old rut for years on end Kanji 十 ten. Read as ジュウ. 年 year. Read as ネン. 一 one. Read as イチ. 日 day. Read as ジツ. Word lists Yojijukugo (四字熟語) Jinuma: Japanese Dictionary · Word lists