baseless

base +‎ -less

• (UK) IPA^(key): /ˈbeɪsləs/

baseless (not comparable)

1. Of reasoning: based on something that is not true.

   baseless accusations; baseless rumors

   • 2016 January 31, "Is Huma Abedin Hillary Clinton’s Secret Weapon or Her Next Big Problem?," Vanity Fair (retrieved 21 January 2016):

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

2. Without a physical base.
   • 2009, Penelope Curtis, On the meanings of sculpture in painting, volume 1, page 18:

     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.

• groundless
• unfounded

• baselessly
• baselessness