The phrase "adamant support" is correct and usable in written English.
It can be used to express unwavering or strong support for a person, idea, or cause.
Example: "The committee expressed its adamant support for the new policy, emphasizing its importance for community welfare."
Alternatives: "strong support" or "unwavering support".
While the foreign minister, Sergey V. Lavrov, insisted that Russia still opposed any United Nations Security Council effort that might coerce Mr. Assad's exit, he appeared to soften Russia's adamant support for him.
Page A5 RUSSIA EASES SYRIAN STANCE While the Russian foreign minister, Sergey V. Lavrov, insisted that Russia still opposed any United Nations Security Council effort that might coerce Syrian President Bashar al-Assad's departure, he appeared to soften Russia's adamant support for him.
Their adamant support for the measure imposes their religious beliefs on others, which I think is just plain wrong and offensive.
Radio producer and collector of social media hypocrisy Matt Binder has tapped into a new Twitter goldmine: conservatives apparently forgetting their adamant support for bringing captured Sgt. Bowe Bergdahl home at any cost.
Day cares are an ideal market because they have a vested interest in reducing disease transfer amongst children, and have adamant support from their clients [parents] to create as clean an environment as possible.
D. W. Kellogg, the Met gatekeeper, was adamant in support of the Met's "unwritten rule that a man must be properly dressed, and his clothes must not be dirty, and he must have all his clothes on".
The designer is adamant about supporting the cause.
As Shapiro concedes that parenting a child entering into the world of DJing isn't a well-tread path to be on, she and her husband, Jude's father Eddie Shapiro, are adamant about supporting their son's musical ambition.
Women in this study were quite adamant that peer support would be a preferred option for mental health support.
Equally adamant in their support of the bill are Brazil's "ruralistas," legislators representing agricultural interests.
In fact some Congressional Democrats seemed, if anything, to be more adamant in their support than they were the day before.
