baseless

This term carries a strong negative connotation, often implying that a claim is not just incorrect, but intentionally fabricated or recklessly asserted. It is frequently employed in legal, political, or formal disputes to dismiss an opponent's argument as lacking any supporting evidence.

While similar to "unfounded," baseless suggests a total absence of a starting point or "base," making the accusation seem absurd or impossible. It is rarely used for honest mistakes, instead targeting claims that are perceived as malicious or groundless.