Meaning

adjective abounding in rocks or stones

adjective causing or characterized by jolts and irregular movements

adjective liable to rock

originFrom Middle English rokki, rokky (“rocky”), from rok, rokke (“rock; a rock or stone; large rock by a coast or in the sea; rocky outcrop on a mountain, cliff; castle, citadel, stronghold”) [and other forms] + -i (suffix forming adjectives). Rok, rokke are derived from: * Old English *rocc (“rock”); and * Anglo-Norman roc, roce, roque, and Old French roce, roke, roque, variants of roche (“rock”);…

Etymology from Wiktionary, CC BY-SA 3.0