Spanish · Pronunciation Guide
noh, one tight syllable — the vowel is a pure "oh" that does not slide into a w.
One syllable, and unlike most short function words this one does carry weight — as a negation it takes real emphasis. In "no entiendo" the "no" is stressed and glued onto the verb, giving no-en-TIEN-do with two peaks rather than one.
Listen: no
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No entiendo nada.
I don't understand anything.
Listen: No entiendo nada.
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"No entiendo nada" is a double negative, and Spanish requires it — "no" before the verb and "nada" after it are both mandatory, where English would find one of them redundant. Listen to "no entiendo": the o runs straight into the e with no gap, so the two words share a single breath.
The only sound issue is the glide. English speakers say their own "no", which starts at "oh" and drifts toward "oo" as the lips close; Spanish holds one position and cuts it off. Say it shorter than feels natural and you will be close. The grammar catches more people than the phonetics: leaving out the second negative and saying "entiendo nada" is a very common beginner error, and it sounds distinctly wrong.