Explanation
The antonym of "frivolous," which means lacking seriousness or sense, is "wise," as it denotes sound judgment and seriousness. The other options—silly, petty, and trivial—are synonyms or related to frivolousness, not opposites.
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The antonym of "frivolous," which means lacking seriousness or sense, is "wise," as it denotes sound judgment and seriousness. The other options—silly, petty, and trivial—are synonyms or related to frivolousness, not opposites.