Spanish · Pronunciation Guide
deh-mah-SYAH-thoh, four beats — the ia glides into one, so it is not five.
Four syllables — de-ma-SIA-do — with the stress on the second-to-last because the ia counts as one diphthong and the word ends in a vowel. All four forms keep the placement. When used as an adverb — too, rather than too much of something — it stays in this masculine singular shape and never agrees with anything.
Listen: demasiado
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Este cuarto es demasiado caro.
This room is too expensive.
Listen: Este cuarto es demasiado caro.
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"Este cuarto es demasiado caro" uses the adverbial form modifying an adjective, so no agreement is needed despite "cuarto" being masculine. Compare "demasiados cuartos", where it becomes a quantifier and does agree. "Caro" has a single tapped r, and "cuarto" glides its ua into one beat.
Pull the ia apart and the word stretches to five syllables, "de-ma-see-AH-do", when four with a glide is correct. Then the two opening vowels get reduced into a mumble, which is what English does to any word this long. Keep eh and ah clear. The d near the end also needs softening toward a th, and in casual speech many speakers drop it entirely.