The story
- Proto-Germanic · inherited from*grundulausaz
- Old English · inherited fromgrundlēas
- Middle English · inherited fromgroundles“bottomless”
- English todaygroundless
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 4.0.