Japanese · Pronunciation Guide
yo-wa-i, three beats — three different glides and vowels, none of them merging.
yowai
There is a crest on wa, but nothing in the word is lengthened. The word is built almost entirely of glides and vowels, which makes it slippery: there are no hard consonants to anchor the beats, so the timing has to come from the vowels themselves being fully articulated.
Listen: 弱い
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弟は体が弱いです。
Otouto wa karada ga yowai desu.
My younger brother is in frail health.
Listen: 弟は体が弱いです。
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弟は体が弱いです includes 体 (ka-ra-da), three crisp beats with a tap in the middle, and 弟 (o-to-u-to), four morae with a long o hiding in the middle. The sentence therefore has a held vowel early and a vowel sequence late — opposite demands on your sense of timing.
"yo-WYE" collapses the second and third morae into one English diphthong with stress on it, giving two beats instead of three. Articulate wa clearly — lips compressed, then a real a — and then pulse the i separately. Learners also round the initial yo too much, importing the English glide that this vowel doesn't have.