Japanese · Pronunciation Guide
zen-bu, three beats — the ん takes a full count and turns into an m-ish hum because a b follows.
zenbu
Three morae, with the nasal in the middle carrying no vowel of its own. That middle beat is the whole rhythmic story: English reads two syllables and delivers two beats, while Japanese spends a third of the word's duration on a hum. Give it its own honest count.
Listen: 全部
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宿題を全部やりました。
Shukudai o zenbu yarimashita.
I did all my homework.
Listen: 宿題を全部やりました。
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宿題を全部やりました opens with 宿題 (shu-ku-da-i), where the ku between two voiceless consonants routinely devoices, so the word can sound like "shk'dai." Then 全部 arrives with its full nasal beat. One word losing a vowel entirely and another gaining a vowel-less beat, side by side.
"ZEN-boo" is the standard English attempt: two syllables, a stressed first, a rounded final vowel, and a quick n rather than a held one. Three fixes — hold the nasal (and let it become an m before the b, which will feel wrong but is correct), unround the u, and level out the emphasis so neither syllable dominates.