JMdict: 2164190

知る由もない 【しるよしもない】

  1. [exp,adj-i] to have no way of knowing; to be completely ignorant of
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Kanji in this word:

Kanji Meanings On Readings Kun Readings
知 Know, Wisdom チ し.る, し.らせる
由 Wherefore, A Reason ユ, ユウ, ユイ よし, よ.る