Superlative form of spongy: most spongy.(adjective)
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Use "spongiest" in a sentence
"When a church supper was toward, she was always called upon for her wonderful mayonnaise dressing, or her angel-food cake, sure to be the lightest and spongiest in any assemblage of cakes."
"When a church supper was toward, she was always called upon for her wonderful mayonnaise dressing, or her angel-food cake, -- sure to be the lightest and spongiest in any assemblage of cakes."
"Cooling on my kitchen table right now is 24 of the fluffiest, spongiest, lightest cup cakes known to humanity."