groundless

adj.

无理由的，无根据的；平白无故；飞；莫须有

1. Facts have proved these worries groundless.
   事实证明，这些忧虑是没有根据的。
2. She maintains that the accusation is groundless.
   她坚持该指控是毫无根据的。
3. These groundless words can never convince anyone.
   这些没有根据的话，不能服人。

Groundless Belief
Groundless flex circuit cable interconnect
Groundless Grounds:A Study of Wittgenstein and Heidegger
Groundless grounds: A study of Wittgenstein and Heidegger
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Groundless Existence: The Political Ontology of Carl Schmitt
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From groundless universalism to grounded generalism: improving ecological economic indicators of human–environmental interaction