Vocabulary

What does 口が堅い (くちがかたい, kuchi ga katai) mean?

口が堅い (くちがかたい, kuchi ga katai) means tight-lipped, discreet, good at keeping secrets (lit.: hard/firm mouth).

Quick facts
Reading	くちがかたい
Romaji	kuchi ga katai
Level (estimated, JLPT framework)	N1

口が堅いくちがかたい

N1 · estimated, JLPT frameworkkuchi ga katai

tight-lipped, discreet, good at keeping secrets (lit.: hard/firm mouth)

Example sentences

彼女(かのじょ)は誰(だれ)よりも口(くち)が堅(かた)いので信頼(しんらい)できる。
She is more discreet than anyone else, so she can be trusted.
口(くち)が堅(かた)い友人(ゆうじん)にだけ、今度(こんど)の転職(てんしょく)の計画(けいかく)を打(う)ち明(あ)けた。
I confided my upcoming job change plan only to a friend who is tight-lipped.