JMdict: 1678220

口固い 【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
Mouth コウ, ク くち 1
Harden, Set, Clot, Curdle かた.める, かた.まる, かた.まり, かた.い 4