groundless
adj. US //ˈɡɹaʊndɫəs// UK //ɡɹˈaʊndləs// ground·less
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, Danish grundløs, Swedish grundlös.