baseless

perätön, perusteeton Of reasoning: based on something that is not true.

(ux)

But Rodríguez says, “Neither the law nor the facts support Senator Grassley’s baseless allegations and extrapolated conclusions.

More significant still — and most obviously in debt to the painterly imagination — this floating statue is the first baseless statue ever made. It is as though Bernini had taken Michelangelo's 'Pieta' and made it fly.