groundless

The French foreign ministry dismissed the criticism, saying: "Any accusation of systemic racism or discrimination by the police in France is totally groundless. France and its police fight resolutely against racism and all forms of discrimination."

And so it was from the podium of the Democratic National Convention, when the usually admirable Rep. Alexandria Ocasio-Cortez descended into making the groundless claim that Harris “is working tirelessly to secure a ceasefire in Gaza and bringing the hostages home.”

Ms Nemtsova calls the student’s claims “groundless and manipulative” and he admits he has no actual evidence.

Chinese state media has called this accusation "groundless".

Back then, it was called McCarthyism, after the Wisconsin Republican senator who wielded groundless accusations as recklessly as Trump.