Spongy spot can be described as a soft and compressible area that yields to pressure. Its antonyms, on the other hand, are words that describe firmness, solidity, or rigidity. Some antonyms for spongy spot include: hard surface, solid ground, tough terrain, firm ground, rocky terrain, and unyielding surface. These words describe locations or surfaces that are resistant to deformation or changes in shape when pressure is applied. Unlike spongy spots, these surfaces are often difficult to penetrate or compress, making them ideal for high-traffic areas, construction sites, or areas that require a sturdy foundation.