Spanish · Pronunciation Guide
SOO-syoh, two beats — the c is an s sound and the io glides into one beat.
Two syllables, SU-cio, with the weight on the first because the io is a single diphthong and the word ends in a vowel. All four forms keep the placement. The related noun "suciedad" grows to four syllables and moves the beat to the very end, su-cie-DAD, following the d-ending rule.
Listen: sucio
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El piso está sucio.
The floor is dirty.
Listen: El piso está sucio.
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"El piso está sucio" uses estar, since dirt is a temporary condition. "Piso" means floor here, though in Spain it more often means an apartment — a regional split worth knowing. The s in "piso" sits between vowels and still stays a clean hiss, which English would voice into a z.
Two wrong readings compete here: "SOO-kyo" with a hard c, or "SOO-see-oh" with the io pulled apart. Both readings come from applying English spelling logic. The u also wants reading as the English "suck", a flat vowel, when Spanish wants a rounded "oo". Keep it two beats: SOO, then SYOH.