Immaturity (noun)

1. The state or quality of being immature, not fully developed or grown to full potential.
2. The lack of maturity or responsibility in a person's behavior or actions.

Origin:

From "immature" meaning not fully developed or grown to full potential.

Examples:

1. His immaturity was evident in his behavior.
2. The immaturity of the company was reflected in its lack of professionalism.
3. The immaturity of the child was frustrating.
4. Her immaturity made it difficult for her to handle the responsibilities.
5. The immaturity of the team was a major obstacle to their success.