稚嫩 (zhì nèn): young and tender; puerile; soft and immature

He had just turned twenty, and his face still held a certain youthfulness, yet he had already come alone to the big city to struggle for a living.

As soon as spring arrived, tender green buds appeared on the branches in the orchard, filling people's hearts with hope.

Although his voice was still a bit young and immature, he sang with such sincere emotion that he won applause from the entire audience.

Watching her daughter's small, tender hands tightly grip the paintbrush and carefully color, the mother couldn't help but smile.