The phrase "able to effectively counter" is correct and usable in written English.
It can be used when discussing someone's capability to respond to or oppose something successfully, such as an argument, challenge, or threat.
Example: "The new policy is designed to be able to effectively counter the rising rates of cybercrime."
Alternatives: "capable of successfully opposing" or "able to successfully respond to".
Senior FBI officials say the GOP memo's allegations of abuse are inaccurate and unfair, but they also believe the FBI would not be able to effectively counter those claims, because many of the details are classified, according to current and former officials.
At that point, Washington must be ready to immediately resupply Israel for losses incurred by its armed forces in the initial attack, so that Israel will still be able to effectively counter Tehran's proxies, Hamas and Hezbollah, which will be its vehicles for retaliation.
If established governments in Kenya and Nigeria -- with substantial anti-terrorism assistance from the U.S. and other governments -- are unable to stem the AQ tide, is there any reason to believe that the CAR government, which is in reality little more than a name, will be able to effectively counter a Seleka allied with AQ?
Due to the insertion points and sense of rotation, the cruciate ligaments are not able to effectively counter rotational torques.
If you truly want to be able to effectively counter arguments against vegetarianism, you need to know quite a bit about genetics, evolution, intelligent design (be sure to find out which your "opponent" believes in so you can strengthen your case), pathology (both human, animal and plant), and environmental issues (global warming, pollution, and water conservation are often the most useful).
The White House has been unable to effectively counter resistance to transferring detainees to the United States.
Sustainable land use approaches for nature conservation are urgently needed to effectively counter these trends.
To effectively counter the IS challenge, Saudi Arabia will have to match the ambassador's words with deeds.
