Portuguese (Brazil) · Pronunciation Guide
NOWNG — the vowel of "now" run entirely through your nose, in a single beat, with no g or n at the end.
A monosyllable, so it takes the stress by default, and the tilde is a nasalization mark rather than a stress mark. That distinction matters: unlike an acute or circumflex, a tilde says nothing about which syllable is loud. In longer words like "coração" the -ão still draws the stress, but that's because words ending in nasal diphthongs are final-stressed by rule, not because of the tilde itself.
Listen: não
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Não, obrigado.
No, thank you.
Listen: Não, obrigado.
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"Não, obrigado" separates the two words with a comma, but in speech the nasal glide of "não" flows straight into the opening vowel of "obrigado" and colours it. In connected speech Brazilians also weaken "não" heavily before verbs — "num sei" for "não sei" is extremely common — so what you hear in conversation is often much shorter than what's written.
The classic error is finishing with a hard consonant: "nown" or "nowng" with an audible g. There is no consonant at the end at all — the sound simply stops while still resonating in the nose. The other frequent slip is treating it as two syllables, "nah-oh," which sounds nothing like the fused single beat Brazilians produce. Spanish speakers importing "no" get an oral vowel with no nasality whatsoever, which is equally wrong.