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, […]
From Middle English groundles, from Old English grundlēas, from Proto-Germanic *grundulausaz, equivalent to ground + -less. Cognate with Dutch grondeloos, German Low German grundlos, German grundlos, ...
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