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I can't think of any and google has not been helpful.

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Ask at linguistics.SE. There aren't any unvoiced vowels in English or most languages but there are some languages that have them. –  Mitch Aug 9 at 18:23
    
@SrJoven: That's only spelling, not about speaking. –  Mitch Aug 9 at 18:23
    
    
For me: en.wikipedia.org/wiki/Voiceless_glottal_fricative (like h in hat, it's a breath sound, not a vocal sound.) –  SrJoven Aug 9 at 18:51
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Are you among those who simply can't understand why Worcester is pronounced the way it is pronounced? Or why people living closer to the British isles would pronounce secretry rather than secret-ary? Vetrinarian vs Vet-erinarian. –  Blessed Geek Aug 10 at 7:20

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up vote 7 down vote accepted

Voiceless vowels are quite possible, and occur in one way or another in many languages.
After all, all vowels and all consonants that are whispered are ipso facto voiceless.
Whisper [a] and you have pronounced a voiceless vowel.

However, the overwhelming majority of vowel sounds in speech are voiced, since vowel formants are modifications of a voiced airstream from the larynx. Exceptions to this rule fall into a number of categories.

  • in some languages, like Japanese, some vowels become voiceless in some environments
    (in Japanese, high vowels /i/ and /u/ are devoiced between voiceless consonants)
  • in some languages, like English, voiceless vowels are allophones of a consonant phoneme
    (English /h/ is a voiceless vocal onset, a voiceless version of whatever vowel it precedes)
  • in some languages (Comanche, for instance) some vowel phonemes are contrastively voiceless
    (this is quite rare, however -- most voiceless vowels are conditioned rather than contrastive.)
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Yes, it's technically possible, but I think you'd only consider it as an allophone, otherwise, the better transcription might be /h/. Wikipedia lists one example in English as potato, where the first o is not vocalized, but otherwise the mouth is in the same position and there is air flowing. (IPA transcriptiond use a ring for devoicing).

Japanese seems to the more common language for it with their u vowel, but thinking about, European Portuguese might well do it where traditionally transcriptions will normally list them as elided.

For an academic citation, here's an article on devoiced vowels in English and German.

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Which version of English doesn't voice the first syllable of potato? I can't say it unvoiced. –  Andrew Leach Aug 9 at 18:24
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@AndrewLeach I'm SAE, and in rapid speech, I either elide or devoice (it's tough for me to tell the difference, personally, because English initial p is aspirated, and effectively, that's all a devoiced vowel is), going directly from the voiceless /p/ to the voiceless /t/ without vocalizing. In moderate-speed to careful speech, I always voice it. Another example would be identity, where the tit has a high chance of being pronounced similar to /th̩t/, rather than /tɪt/ –  guifa Aug 9 at 18:32
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@Andrew Leach: That was my first thought too. But if you start by saying 'tatoe obviously you don't engage your larynx until after you've delivered that first /t/. Listen carefully to yourself if you just add an initial /p/ before that, and you'll probably realise it's perfectly possible to get both /p/ and /t/ out before you start "vocalising". –  FumbleFingers Aug 9 at 18:39

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