HSK 4
Tā ěrduoruǎn, tīng rénjiā yī shuō jiù xìnyǐwéizhēn le.
She's easily swayed - one word from someone and she takes it as gospel.
HSK 5
Tā ěrduoruǎn, lǎobǎn yī quàn jiù gǎi zhǔyi le.
He's easily swayed - one word from the boss and he changed his mind.
HSK 6
Ěrduoruǎn de rén róngyì shàngdàng.
People who are easily persuaded get taken in easily.