U is the only vowel in this 4-letter adjective that means dull or sullen

If you are looking for the U is the only vowel in this 4-letter adjective that means dull or sullen answer and solution then you have come to the right place. This question aired today (June 20 2022) in the popular Jeopardy! TV Show. If you would like to know the answer then continue reading below:

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