真心实意

zhēn xīn shí yì

sincerely; wholeheartedly

Character by character

真zhēn
true

心xīn
heart

实shí
real

意yì
intention

我是真心实意想帮你，不是客气。

I genuinely want to help — I’m not just being polite.

Tone: positive (praise).

Often contrasted with politeness: 不是客气.

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This idiom and thousands more are in Learn Chinese with Bao, with audio, pinyin and drills that make them stick.