groundless

“The impact on the bookings has been quite hard,” said Patel, who called the lawsuit groundless.

The long-term rise in beef prices has provoked market participants into a spate of finger-pointing, not all of which is groundless.

Beijing at the time called the accusations "groundless".

"But all these claims are groundless and without proof."

The corporation, incidentally, said "these continuing attacks on BBC journalism are completely groundless – it is simply false to say that we give any political party any less scrutiny than any other".