groundless

Without any grounds to support it; baseless.

• [B]e the consequences what they may, they shall not move an inch, nor a hair's-breadth from the ground of their groundless spiritual independence, […]
• At that stage any fears among home fans of a possession monopoly by Laudrup's side were proving groundless, with Cardiff having their fair share of the ball and territory.

Bottomless; having no bottom or floor.obsolete