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Answer: Option 2
Smooth : having an even and regular surface; free from perceptible projections, lumps, or indentations. Hard : solid, firm, and rigid; not easily broken, bent, or pierced. Rough : having an uneven or irregular surface; not smooth or level. Flat : having a level surface; without raised areas or indentations. Tough : (of a substance or object) strong enough to withstand adverse conditions or rough handling. Antonym of Smooth is Rough
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