口の堅い · i-adjective
| Form | Positive | Negative |
|---|---|---|
| Dictionary | 口の堅い | 口の堅くない |
| Polite | 口の堅いです | 口の堅くないですalso 口の堅くありません |
| Past polite | 口の堅かったです | 口の堅くなかったですalso 口の堅くありませんでした |
| Past | 口の堅かった | 口の堅くなかった |
| Te-form | 口の堅くて | 口の堅くなくて |
| Adverbial | 口の堅く | |
| Conditional | 口の堅ければ | 口の堅くなければ |
| Tara conditional | 口の堅かったら | 口の堅くなかったら |
tight-lipped; able to keep a secret
Describes a person who does not reveal secrets or private matters. Often used in the negative form 口の堅くない to mean someone who cannot keep a secret.
See also: 口が堅い
He's a tight-lipped person, so it's safe to tell him a secret.
I only shared that information with a colleague who can keep a secret.
Standard kanji spelling.
Kana spelling of 堅い; common in everyday writing.
Compound of 口 (mouth) + の (possessive particle) + 堅い (hard, firm). Literally 'firm of mouth', idiomatically meaning someone who keeps their mouth shut.