There are certain disadvantages of the agile system which are discussed below.
It is not easy to predict. If a big project is assigned you will have a problem to estimate the effort you need to put into that.
Focusing on design and documentation is not always proper.
The final product will not satisfy the customers if the guidelines given by the client are not properly understood.
The high-level decision making is in the hands of the higher authorities which makes the fresher to have little knowledge.