action

If you don’t address this problem, I’ll be forced to take actions.
If you don’t address this problem, I’ll be forced to take action.

This situation requires a stronger action.
This situation requires stronger action.

When action means something you do to deal with a problem, it is often uncountable: ‘The government has promised immediate action.’ We normally use the uncountable form in the phrase take action.

Action can also be countable when it refers to a particular act or deed: ‘His actions had serious consequences.’