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Jyutping jin4 zi1 sing4 lei5
Pinyin yán zhī chéng lǐ

Definitions (CC-CANTO)
  1. to describe one's words as rational and convincing; cogently argued; sounds reasonable
Definitions (粵典–words.hk)
  1. 語句
    講​嘅​嘢​成​道理​而且​令人信服
    to deliver a claim in a rational and convincing manner
    • 佢講嘢言之成理,抵佢做大狀。
      佢讲嘢言之成理,抵佢做大状。
      keoi5 gong2 je5 jin4 zi1 sing4 lei5, dai2 keoi5 zou6 daai6 zong6.
      His words are charmingly sensible, I see all these tuition spent on law school haven't gone wasted.
  2. 參看
    言之有理
Definitions (Wiktionary)
  1. phrase, idiomatic
    what one says is reasonable
Definitions (Kaifangcidian)
  1. (沒有對應漢語詞彙)
Examples (粵典–words.hk)
  1. Cantonese
    佢讲嘢言之成理,抵佢做大状。
    佢講嘢言之成理,抵佢做大狀。
    keoi5 gong2 je5 jin4 zi1 sing4 lei5, dai2 keoi5 zou6 daai6 zong6.
    • His words are charmingly sensible, I see all these tuition spent on law school haven't gone wasted.