The sherman antitrust act was difficult to support in court because its
terms were hard to understand.
penalties were not strong enough.
definition of monopolies was not clear.
penalties were too strong.

Definition of monopolies was not clear.

Explanation:

The Herman Antitrust Act was a bill created by Senator John Sherman and approved by President Benjamin Harrison. Its objective was to allow all companies in the market to have competitive equality, and large companies did not monopolize the entire market leaving smaller companies without opportunity.

However, certain ambiguities made it difficult to determine when a company was considered to be unfair competition, and when it grew legitimately.

I hope this information can help you.