理路整然(りろせいぜん) りろせいぜん adjective (taru), noun logical and coherent; well-reasoned formalcommunicationevaluation 1. logical and coherent; well-reasoned Of speech or writing: argued in a clear, orderly line of reasoning. Usually 理路整然(りろせいぜん)と (adverbial) or 理路整然(りろせいぜん)とした (before a noun). 理路整然(りろせいぜん)と話(はな)す。 To speak logically and coherently. 彼女(かのじょ)の説明(せつめい)は理路整然(りろせいぜん)としていた。 Her explanation was clear and well-reasoned. 理路整然(りろせいぜん)とした反論(はんろん)に、誰(だれ)も言(い)い返(かえ)せなかった。 Nobody could answer such a well-reasoned rebuttal. Common patterns理路整然(りろせいぜん)と話(はな)す / 説明(せつめい)する: to speak / explain logically理路整然(りろせいぜん)とした文章(ぶんしょう): a well-organized piece of writingEtymology理路(りろ) (line of reasoning) + 整然(せいぜん) (orderly). A four-character compound; like other 〜然(ぜん) words it takes と and とした, not な. general Added 2026.10.4 4:58 · Revised 2026.10.4 5:00 31500/31515_riroseizen