The phrase "able to discourage" is correct and usable in written English.
It can be used when discussing the capacity or capability of someone or something to deter or dissuade others from a particular action or behavior.
Example: "The strict rules in the classroom are able to discourage students from misbehaving."
Alternatives: "capable of deterring" or "able to dissuade".
Neither age, nor hailstorms have been able to discourage him thus far.
"I tried very hard to give Benjamin a realistic picture of what was ahead of him, and I was not able to discourage him," Fabius says.
No amount of cosmic silence has been able to discourage astronomers who theorize that radio signals can bridge the unbridgeable gulfs between stars much more cheaply than spacecraft, allowing distant species to communicate by a sort of cosmic ham radio.
"What we want to ensure is we are using this as a tool to be able to discourage people and understanding that they will be subjected to accountability if they subject paramedics to violence and aggression".
The union, the National Association of Broadcast Employees and Technicians, has been able to discourage some public figures and celebrities -- including Vice President Al Gore, the Rev. Jesse Jackson and, most recently, George Foreman, the boxer -- from appearing on ABC News programs since the lockout began on Nov. 2.
Based on our figures, it looks like Google was able to discourage link spamming practices, causing a 75% decrease in automated link spamming activity.
In England and Wales, the architects of the New Poor Law attempted to discourage able-bodied men from seeking poor relief by introducing the principle of "less eligiblity".
German officials said the change in long-term benefits was intended to discourage able-bodied people from permanently opting out of the work force.
Today, poor career prospects for science doctorates continue to discourage many able science majors from pursuing graduate education, "because they don't see a career path" other than the traditional Ph.D., Teitelbaum said.
Once approved, they must increase the security on their Twitter accounts, presumably to discourage hackers from being able to spam users' phones.
However, the sites hope that by putting up extra hurdles they may be able to at least discourage some of the troublemakers - or perhaps divert them elsewhere.
