Chinese · Pronunciation Guide
jun-duh: a high level first syllable with the tongue curled back, then a weak toneless particle.
zhēnde
Level then nothing. Because de carries no pitch of its own, it simply extends zhēn's plateau — which means this word ends high, and a following third tone is unaffected by anything in it. That last point matters in the example sentence, where a dipping adverb comes straight after.
Listen: 真的
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你真的很好。
Nǐ zhēnde hěn hǎo.
You're really kind.
Listen: 你真的很好。
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你真的很好。 keeps nǐ at a full dip before the level zhēn, then de fades at that height, and hěn and hǎo are adjacent third tones so hěn rises: hén hǎo. The sentence therefore ends with the standard conversion, and the toneless de in the middle is what keeps zhēn and hěn from interacting at all.
Giving de a full tone is the usual error — it makes the phrase sound like two separate words rather than an intensifier. Let it go slack. The retroflex is the other issue, flattened into an English j, and the front n at the end of zhēn drifts to zhēng. Three small things, and the hěn hǎo conversion at the end makes four.