adamantly

This adverb conveys a sense of stubbornness and unyielding resolve. It is typically used in contexts of refusal, denial, or insistence, where the speaker wants to emphasize that no amount of pleading or argument will change the subject's position. It carries a stronger, more rigid connotation than "firmly" or "strongly."

In terms of register, it is common in both formal writing and spoken English, though it often appears in legal or journalistic contexts to describe a person's steadfast stance during a conflict or interrogation. Because it describes an internal state of certainty, it is almost exclusively paired with verbs of communication or mental state.