1. Unsuited to the needs of a Big Country:
It is quite unsuitable for big countries having diversity of race, religion, language etc. It ignores the local interests of the people, which are sacrificed on the altar of national interests.
Aspirations of various nationalities and national minorities are at times curbed in a unitary state.
2. Local needs Ignored:
It cannot give full attention to various needs of different areas within the country. The central administration may ignore local requirements of different parts of the country.
3. Centre over-burdened:
The central government is overburdened with legislative and administrative work in a unitary government
It is liable to turn despotic since all authority is vested in a single central government without any checks and restraints.