Italian · Pronunciation Guide
STES-soh, stress on the first syllable, with the double s held noticeably longer than a single s would be. In IPA: /ˈstes.so/.
Two syllables, stes and so, weight on the first. The doubled s is the detail to focus on: it's not decorative spelling, it genuinely lengthens the sound and helps carry the stress.
Listen: stesso
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The double s is doing real phonetic work here, exactly like the double f in "difficile": it's held for longer than a single s, and losing that length changes how the word sounds even though English speakers rarely register consonant length as meaningful.
Abbiamo lo stesso problema.
We have the same problem.
Listen: Abbiamo lo stesso problema.
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"Lo stesso problema" shows "stesso" doing its most common job: sitting between the article and the noun to mean "the same," the mirror image of how English places "same" in that exact slot too. Note the article is "lo," not "il," because "problema" — despite ending in -a — is masculine, one of a small class of Italian nouns (mostly of Greek origin, ending in -ema or -amma) that break the usual -a-equals-feminine pattern.
"Stesso" also attaches to pronouns for emphasis, as in "io stesso" ("I myself") or "lei stessa" ("she herself"), a construction with no single-word English equivalent.
The double s almost always gets shortened to a single s by English speakers, since English spelling uses double letters purely as a visual convention (compare "letter" and "later," pronounced with the same single t sound). In Italian, "stesso" with a short s sounds noticeably clipped and wrong to a native ear — the doubling is a real, audible difference in length.
The other issue is the initial "st" cluster, which some English speakers soften by adding a slight vowel before the s, a habit left over from how English syllabifies words like "mistake." Italian "st" at the start of a stressed syllable is pronounced as a tight, immediate cluster with no vowel intruding.