Correct option is D
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Meaning of "Dingy": Dark, dull, or shabby.
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Synonyms: Drab, gloomy, murky.
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Antonyms: Bright, clean, pure.
Meanings of Options:
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Pure: Free from any contamination (शुद्ध).
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Sterile: Completely clean and free of bacteria (निर्जीव, रोगाणु रहित).
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Immaculate: Perfectly clean (निर्मल).
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Drab: Lacking brightness or interest (म्लान, फीका).