The phrase "a powerful enemy in" is correct and usable in written English.
It can be used when discussing a significant adversary in a specific context, such as a conflict, competition, or challenge.
Example: "In the realm of politics, he has emerged as a powerful enemy in the fight for reform."
Alternatives: "a formidable opponent in" or "a strong adversary in".
But they also are ambitious and may want to serve in the administration, or at least see no upside to antagonizing a powerful enemy in the Oval Office.
Observers say the law is part of a clampdown on free expression and an effort to create a powerful enemy — in this case, Mr. Soros, a financier who embodies, for Mr. Orban, the influence of global capitalism.
But he made a powerful enemy in the anti-Wagnerian critic Eduard Hanslick, whose hostility caused Bruckner much pain and soul-searching.
But the fearsome fish face a powerful enemy in humans, who've decimated their populations by commercial fishing.
However, they encountered a powerful enemy in the film named the Goa'uld, which is bent on destroying Earth and all that opposes them.
Early in his conductorship Smetana had made a powerful enemy in František Pivoda, the Director of the Prague School of Singing.
"I'm quite impartial". And as the malady that was thought to have lamed Franklin D. Roosevelt -- there is some dispute now as to whether it was in fact polio Roosevelt contracted -- it made a powerful enemy: The president personalized and, in a sense, nationalized the disease, drafting his old law partner Basil O'Connor to lead the fight.
He told them they faced a powerful enemy, and that death and defeat were probable in the struggle lying ahead.
All this dithering by Burnside left his force of 120,000 divided "in the immediate presence of a powerful enemy".
In lighting Richard's Department Store in Miami, Feder was up against a powerful enemy - the glaring Florida sun.
