There are no perfect rhymes for the word gratuitous.
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Gratuitous means unwarranted. It can also man done free of
charge. Dinner was gratuitous with your room rental. Gratuitous
advice is not always welcome.
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The jury found the man's crime to be gratuitous.
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Gratuitous Space Battles happened in 2009.
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I chose not to view films featuring gratuitous violence!