Portuguese (Brazil) · Pronunciation Guide
poh-SEE-veh-oo. The double s is one plain s, and the final l becomes a w.
The accent is overriding a rule. Words ending in l are normally end-stressed — azul, legal, gentil — so without that mark you would read this as pos-si-VEL. The acute holds the weight in the middle instead, and the plural "possíveis" keeps the accent for exactly the same reason.
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Isso não é possível.
That's not possible.
Listen: Isso não é possível.
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"Isso não é possível" ends on the vocalized l with nothing following, so the w-glide simply fades. "Isso" uses the same unvoiced double s as "possível" itself, and "não" contributes its nasal diphthong, giving the sentence a nasal in the middle and two hissed s's around it.
The final l draws a real l from English and Spanish speakers alike, producing "po-SEE-vel." Brazilians say "veh-oo." The doubled s tempts learners into lengthening it, which Portuguese never does. And ignoring the accent shifts the stress to the end, which changes the word's shape completely.