tight-lipped

Adjective

literally idiomatic

(literally) Having the lips pressed tightly together, hence, not speaking. / (idiomatic) Unwilling to divulge information.

Japanese Meaning

唇を固く結んでいる状態、つまり黙っていることを表す / 情報を漏らさず、秘密を守る性質や態度を示す

When asked about the scandal, the CEO remained tight-lipped, offering only a brief nod.

スキャンダルについて尋ねられたとき、CEOは口を固く閉ざし、ただ短くうなずいただけだった。

Sense（1）

(literally) Having the lips pressed tightly together, hence, not speaking.

He would have sprung upon Captain Blood, who stood aloof, alert, tight-lipped, and watchful.

Sense（2）

(idiomatic) Unwilling to divulge information.

more tight-lipped

（ comparative ）

most tight-lipped

（ superlative ）