Final answer:
Montesquieu believed that in an absolute monarchy, citizens could lose their freedom due to the risk of tyrannical laws and actions from a unified legislative and executive power.
Step-by-step explanation:
According to Montesquieu, in an absolute monarchy, where the legislative and executive powers are united, citizens could lose their freedom. This concentration of power could lead to the enactment of tyrannical laws and their tyrannical execution, which is antithetical to liberty. Montesquieu advocated for the separation of powers into different governmental branches to ensure political liberty and protect against tyranny.