くちかた 口の堅い Show inflections LinksSentence search for 口の堅いSentence search for くちのかたいSentence search for 口のかたいKanji details for 口 and 堅Edit in JMdict Expressions (phrases, clauses, etc.), I-adjective (keiyoushi)1. tight-lipped; able to keep a secretSee also 口が堅いOther forms口のかたい 【くちのかたい】 Discussions Log in to talk about this word.