JMdict: 1678220

口堅い 【くちがたい】

  1. [adj-i] discreet; tight-lipped
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Kanji in this word:

Kanji Meanings On Readings Kun Readings Grade
口 Mouth コウ, ク くち 1
堅 Strict, Hard, Solid, Tough, Tight, Reliable ケン かた.い, -がた.い