putty in someone's hands

idiomatic of a person uncountable

(idiomatic, of a person) One who is readily manipulated or controlled by another person; a puppet.

Japanese Meaning

他人によって容易に操られる、またはコントロールされる人物 / 操り人形のように扱われる人

Although he seemed confident, he was putty in someone's hands after meeting the charismatic leader.

一見自信があるように見えたが、彼はカリスマ的な指導者に会ってから簡単に操られる人になってしまった。

Sense（1）

(idiomatic, of a person) One who is readily manipulated or controlled by another person; a puppet.

Why, Marseny, here, he wan't no more than so much putty in her hands.