Japanese · Pronunciation Guide
na-ze, two short beats — a buzzing z and a flat "eh," not "zay."
naze
Two beats of matching size, with the crest on the first. Both vowels are short and neither consonant is lengthened, which makes this a compact word; English speakers, treating it as a weighty question word, routinely stretch it to twice its proper length.
Listen: なぜ
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なぜ悲しいのですか。
Naze kanashii no desu ka?
Why are you sad?
Listen: なぜ悲しいのですか。
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なぜ悲しいのですか is followed by 悲しい with its long final i — two beats of held vowel — and then のですか. So a very short question word sits directly in front of a word with genuine length in it, making the contrast easy to hear if you deliver both accurately.
The reflex is "NAH-zay," with a stretched stressed first beat and an English diphthong on the second. Both vowels are short and pure. The e in particular must not travel — anchor your tongue and jaw for its whole duration. And keep the z light rather than buzzing it for emphasis.