Japanese · Pronunciation Guide
ka-na-shi-i, four beats — two matching short a's, then a long i held for two counts.
kanashii
Four morae with the last two given over to a single long vowel. Compared with 嬉しい it has the same back-weighted shape but a different opening, which makes the pair useful to drill together: same rhythm, different consonants, and neither with a stressed syllable anywhere.
Listen: 悲しい
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昨日悲しい映画を見ました。
Kinou kanashii eiga o mimashita.
I watched a sad movie yesterday.
Listen: 昨日悲しい映画を見ました。
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昨日悲しい映画を見ました contains 映画, whose "ei" is pronounced as a long e rather than as two distinct vowels — so it comes out roughly "eega," three morae. Placing that beside the long i of 悲しい gives you two different long vowels in adjacent words, and both need their full two counts.
"ka-na-SHEE" — three beats with a stress peak at the end and a clipped vowel — is what English produces. Two problems: the emphasis, which Japanese doesn't use, and the length, which it very much does. Match the two a's, level the volume, and hold the final i long enough that it feels like an extra syllable.