The correct answer is Option (2) → Robustness
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Languor means the state or feeling of tiredness or inertia; a pleasant weariness or relaxation; general feeling of listlessness. It implies a lack of energy and vitality.
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Robustness means the quality or condition of being strong and healthy; vigor. This is the direct opposite of lethargy or lack of energy.
Why the Other Options Are Incorrect:
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Opulence: Great wealth or luxuriousness. (Unrelated to energy level.)
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Indolence: Avoidance of activity or exertion; laziness. This is a synonym for languor.
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Apathy: Lack of interest, enthusiasm, or concern. (Similar to the listlessness associated with languor.)
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