Inexperience (noun)

1. Lack of experience; the state or condition of having had little or no experience of something.
2. Lack of knowledge or skills acquired through experience.
3. Lack of exposure or familiarity with a particular subject or situation.

Origin:

From in- ("not") + experience.

Examples:

1. His inexperience in the field was evident.
2. Her inexperience showed during the interview.
3. The team's inexperience was a major factor in the loss.
4. The company's inexperience in the market was a disadvantage.
5. The politician's inexperience was a concern for voters.