烂 (làn): rotten, worn-out; soft

These peaches are already too soft and rotten; they leak juice at the slightest touch. Don't eat them—I'll go throw them away.

He forgot about the tomatoes in the fridge. Two weeks later, they had all gone soft and rotten, so he had to throw them all away.

These shoes soaked in the rain all night; the soles have become soft and rotten, crumbling with every step. They can't be worn anymore.