千慮一失 せんりょいっしつ Also written せんりょのいっしつ Meanings Noun mere slip by someone who is usually very careful; simple mistake by a wise person; point overlooked by a cautious person Kanji 千 thousand. Read as セン. 慮 consider. Read as リョ. 一 one. Read as イチ. 失 lose. Read as シツ. Word lists Yojijukugo (四字熟語) Jinuma: Japanese Dictionary · Word lists