State the disadvantages of using Agile model?

As there are advantages, there are disadvantages as well for using an agile model; they are as follows:

1. Focusing on documentation and design is not proper sometimes.
2. If there is even a simple mistake in understanding the guidelines that are provided by the customers, then programmers may have to do it all again or else the outcome of the project will not be satisfying to the customer.
3. Agile model is not that to predict. When encountered with a large project, it is not easy to predict the amount of effort needed in the project.
4. Basically, High-level decisions are catered by Veterans, which is most of the time combined with non-experienced ones. Fresher may have no to little scope to grasp proper knowledge.