Groundless means having no basis in fact. Groundless fears, a groundless accusation, entirely groundless.
It belongs to fears, rumours and accusations, and it is stronger than untrue because it says there was never anything there to begin with. The ground in it is the old sense meaning a foundation.
1adjectivegroundlessHaving no basis in fact.
“The rumours about the company closing turned out to be completely groundless.”
groundless is a quality.
Also accepted in games: unfounded
Old English grundleas first meant bottomless, from grund, a bottom or foundation, plus -less.
Proto-Germanic
*grundulausaz
Old English
grundlēas
Middle English
groundles — bottomless
English, today
groundless
From Middle English groundles (“bottomless”), 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.
Etymology from Wiktionary, CC BY-SA