Japanese · Pronunciation Guide
shi-n-se-tsu, four beats — a nasal hum in second place and an affricate at the end.
shinsetsu
Four morae, and only two of them carry a clearly audible vowel: the nasal has none, and the final u typically loses its voicing. That means half the word is voiceless or vowel-less, yet the timing is still four even counts — a good demonstration that Japanese rhythm is measured, not heard.
Listen: 親切
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店の人はとても親切でした。
Mise no hito wa totemo shinsetsu deshita.
The shop staff were very kind.
Listen: 店の人はとても親切でした。
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店の人はとても親切でした ends with でした, where the shi devoices between the voiceless consonants around it, so the ending comes out close to "desh-ta." That's a second devoiced mora immediately after the one in 親切 — a run of whispered beats at the sentence's end that still occupy full time.
"SHIN-set-soo" delivers three syllables with English stress on the first, a nasal treated as a closing consonant, and a split, rounded affricate. Three fixes: hum the ん for its own beat, keep the tsu as one gesture, and spread the lips so the final vowel devoices rather than ringing out as "soo."