Explanation
The Correct Option is (c) Sporadic.
Vocabulary Breakdown
To identify the opposite, we first define the core meaning of the word:
Logical Analysis
We are looking for the word that describes something happening with frequent breaks or occurring only at irregular intervals.
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Perpetual: Means occurring repeatedly or so frequent as to seem endless. This is a Synonym of Incessant.
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Persistent: Means continuing firmly in a course of action in spite of difficulty. While often positive, it implies a continuous nature, making it a Synonym or near-synonym.
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Sporadic: This means occurring at irregular intervals or only in a few places; scattered or isolated. This is the direct Antonym of Incessant.
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Unrelenting: Means not yielding in strength, severity, or determination. This also implies a continuous, non-stop nature, making it a Synonym.
Conclusion
The relationship of opposites can be visualized as a timeline of events:
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Incessant: A solid, unbroken line of activity.
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Sporadic: A broken line with large, irregular gaps between activities.
INCESSANT≈Continuous / Unbroken
Antonym of INCESSANT≈Intermittent / Broken
Therefore: