How about "shrewdly" (if you don't count the y as a vowel)?
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There are thousands of English words with only one vowel.The words I and a consist of only a single vowel.
every word in the english language has a vowel.
The vowel O in owl is controlled by the following W, making the vowel neither short or long. It makes the sound OW, as in COW.
Rhythm = contains six letters and the only vowel in this word is the "y".
The answer is not the obvious "e" the word Vowel in it self is "vowel" being 6th, so it is the letter a.