Gǎigé zuì dà de zǔlì wǎngwǎng láizì tǐzhì de duòxìng.
The biggest resistance to reform often comes from the inertia of the system.
Tips
usage
In physics the modern word for inertia is 惯性; 惰性 there is older usage. In chemistry the "lazy" elements are the 惰性气体, the noble gases, which barely react with anything.