groundless

The word "groundless" is a transparent English compound formed from native Germanic elements. Its first element, "ground," evolved from the Old English grund, which originally meant the bottom of something, like the sea or a ditch, and by extension came to signify the solid base of the earth or, metaphorically, a foundation for reasoning. The suffix "-less," from Old English -lēas, denotes an absence or lack. Therefore, the literal construction "without a ground" perfectly captures the modern abstract meaning: an assertion or fear that lacks a solid base of fact or reason, leaving it unsupported and floating in uncertainty. This logical compounding showcases how English can build sophisticated abstract adjectives from concrete, foundational roots.

Structure: ground (base, foundation) + less (without) - ground: From Old English grund (bottom, foundation, earth). In this compound, it carries the abstract sense of "basis" or "foundation for belief." - less: From Old English -lēas (devoid of, free from), an adjective-forming suffix meaning "without."