Italian · Pronunciation Guide
PYEH-noh, with PYEH said as one quick syllable rhyming with "yeah" preceded by a p, and a short "noh" to close. In IPA: /ˈpjɛ.no/.
Written with three vowel letters in a row, i-e-o, but only two syllables are actually spoken, pie and no — the i glides quickly into the e rather than forming its own beat.
Listen: pieno
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"Pieno" introduces the Italian glide: when i sits in front of another vowel, it often collapses into a quick "y" sound rather than staying a full syllable, which is exactly what happens here.
Il bicchiere è pieno.
The glass is full.
Listen: Il bicchiere è pieno.
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"Pieno" agrees with the masculine noun "bicchiere" (glass) here, keeping its base -o ending; the feminine form "piena" would be used for something like "la bottiglia" (the bottle).
This is a simple, common pattern for describing the state of a container — "pieno" and its opposite "vuoto" are two of the most frequently used adjectives for talking about what's in front of you at a table or in a kitchen, well beyond any formal or written register.
The most common mistake is pronouncing the i as its own full syllable, saying something like "pee-EH-noh" in three distinct beats instead of two. English readers expect every written vowel to get its own sound, but here the i is purely a glide, blending into the following e rather than standing apart from it.
The other slip is closing the e into a tighter vowel, drifting toward "PYAY-noh." Keep it open and flat, the same vowel as in "bed," rather than letting it glide the way English "ay" does.