An object or person that's shrunken and lost their shape is shriveled. This can happen to fruits and vegetables when they're not ripe yet.
When we talk about something being shriveled, it usually means that it was once full of life and juice, but now it's dry and wrinkly. Imagine a raisin - what used to be a plump grape has turned into a small, hard thing. This happens naturally with food when it gets old or doesn't get enough water. If you're looking at an apple that's shriveled up on the counter, you know it didn't ripen properly.
To collapse inward; to crumble.
Example: The plant shrivelled from lack of water.
Wrinkled because the volume has reduced while the surface area of the outer layer has remained constant.
Example: A prune is a shriveled plum.
