Japanese · Pronunciation Guide
ze-n-ze-n, four beats — two vowels and two nasal hums, alternating.
zenzen
Four slots, half of them vowel-less. The word alternates vowel-nasal-vowel-nasal, which makes it an ideal drill: you can literally feel the two hums taking as much time as the two vowels. English delivers it in two syllables and loses half its length.
Listen: 全然
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この漢字は全然読めません。
Kono kanji wa zenzen yomemasen.
I can't read this kanji at all.
Listen: この漢字は全然読めません。
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この漢字は全然読めません is a sentence with three moraic nasals in it — 漢字, 全然 twice, and ません at the end. That's four vowel-less beats in one line. Counting them all is the difference between sounding like you're reading and sounding like you're speaking.
"ZEN-zen" in two syllables is what English produces, treating both n's as consonants closing their syllables. They're beats. Hum each one for its own count, and notice they're not identical: the first sits at the teeth-ridge because a z follows, the second is made further back. Four counts, not two.