The phrase "ambitious opponent" is correct and usable in written English.
It can be used to describe a rival or competitor who is highly motivated and determined to succeed.
Example: "In the upcoming election, we will face an ambitious opponent who has been tirelessly campaigning for months."
Alternatives: "driven rival" or "determined adversary".
Neither the mayor nor his ambitious opponent made a public statement on Sunday night.
Something different is needed against Jordan a less fancied, less glamorous and less ambitious opponent in front of an expectant home crowd.
More significant perhaps, for once they find themselves pitted against an even more rapaciously ambitious opponent, a club that has already consumed its own domestic league and will not rest until it has, in the words of Zlatan Ibrahimovic, "hunted down this Champions League".
Floyd Patterson suffered at his hands, as did more ambitious opponents, Ernie Terrell and Cleveland "Big Cat Williamss.
Levein, still finding his way in the position, believed his squad to lack the wherewithal to be bold or ambitious against most opponents.
He wants to hit it fully extended and slightly out in front of him — he wants to be able to hit emphatically down on the ball, to generate enough pace to avoid an ambitious return from his opponent.
Now, stung by the force and persistence of the protests, the government appears to be starting a far more ambitious effort to discredit its opponents and re-educate Iran's mostly young and restive population.
But how many PD lawmakers could bring themselves to defy a verdict of the courts and vote in support of a man whom many of them detest Tensions within the centre-left have been growing for months between its ex-Communist and formerly Christian Democratic wings, and between supporters and opponents of the ambitious young mayor of Florence, Matteo Renzi.
The results highlight a combination of factors such as the absence of supporters and the presence of active opponents, an overly ambitious scheduling, and a goal-related drift.
But it's time to fight more seriously, against more difficult opponents and more ambitious goals.
But opponents say the ambitious project will generate a host of problems — not least of which could be the destruction of Central America's largest fresh water lake.
