The phrase "a direct adversary" is correct and usable in written English.
It can be used to describe someone who is an open and straightforward opponent in a conflict or competition.
Example: "In the debate, she faced a direct adversary who challenged her arguments at every turn."
Alternatives: "a clear opponent" or "a straightforward rival".
The major Kurdish militia in Syria is a largely secular group that is a direct adversary of Islamic State, an Al Qaeda breakaway faction.
Bayik clearly sees Erdogan as a direct adversary, continually lambasting his "Sultanic" ambitions or comparing him to Kenan Evren, the army officer-turned-president who seized power in a 1980 military coup and went on to abolish parliament, senate, and constitution, while eroding civil rights and liberties.
Many technologies have some type of vulnerability, and a directed adversary can figure out vulnerabilities to exploit and gather intelligence".
The extent of this interest was such that the local military took the rare step of ignoring diplomatic concerns, requesting help from the anti-piracy task force known as the West Indies Squadron which operated under the flag of the Empire's direct adversary, the United States.
Officials provided few details about Mr. Tretyakov's case, but several current and former officials said his acceptance as a defector when Washington and Moscow were no longer direct adversaries indicated that he had information that the United States considered significant.
He was also helped in the race by the different strategies of other drivers getting in the way of his direct adversaries, particularly the strategy of Jenson Button in the McLaren Mercedes, where Hamilton had driven from his first year in Formula One in 2007 until last season.
Sweden, at that time an expansionist empire with an army designed to be maintained by the revenues of occupied territory, was conscious that a direct attack on her main adversary Russia could well result in a Dano-Polish Russian alliance.
According to Captain Gerald Mauer, the road map notes that information operations would be directed against an "adversary".
The New York Daily News went much further in denouncing the Republicans' direct communication with a geopolitical adversary at the height of negotiations.
Could an operative dose an adversary with a handshake?
It is highly unusual when directed at a longtime geopolitical adversary — much less one who has been accused of crimes against humanity for his regime's treatment of its citizens.
