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LONGERT WORD WITHOUT VOWELS
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Correction: What is the longest word without vowels?
Answer: In English, there are no words without vowel sounds. The longest I know of is nth, which begins with a vowel sound. An afterthought: I don't consider pssst to be a word, and neither does my spell checker.
Comments  
Students: Are you brave enough to let our tutors analyse your pronunciation?
I think symphysy is the longest non vowel word I do know:)

TWYNDYLLYNG is the longest word without a vowel