Portuguese (Brazil) · Pronunciation Guide
FREE-oo. Two syllables, not one — the i and the o don't fuse into a diphthong.
The i is the loud one, which only works because it and the o are separate syllables rather than a diphthong. Portuguese generally keeps a stressed i apart from a neighbouring vowel, which is why "frio" is two beats while "rio" and "tio" are also two, and why "pai" and "mais" are one.
Listen: frio
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Está frio hoje.
It's cold today.
Listen: Está frio hoje.
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"Está frio hoje" would come out as "tá frio hoje" in ordinary speech. Because "hoje" begins with a silent h, the final "oo" of "frio" runs straight into it, so the three words flow as one continuous stream ending in that soft "zh."
Squashing it into one syllable — "free-oh" said as a single glide, or worse "fryoh" — is the standard error. Give the o its own beat. English speakers also leave that o unraised. And note the noun-adjective split: "está frio" describes the weather, but "estou com frio" is how you say you personally feel cold, using "frio" as a noun.