The compound "waterlogged" is a vivid nautical term from the 18th century. Its first element, "water," derives from the ancient Proto-Indo-European root wod-or, referring to the essential liquid. The second element, "logged," originates from the noun "log," a thick piece of wood, which by the 1700s had developed a verbal sense describing the sluggish, heavy movement of a ship, as if it were a water-soaked log. Thus, the term's literal logic perfectly captures the state of being so thoroughly saturated with water that an object becomes inert, heavy, and unmanageable, whether describing sodden ground or a flooded vessel.

Structure: water (liquid H₂O) + logged (made heavy or slow) water: From Old English wæter, of Proto-Germanic origin; the core substance. logged: From the verb log, in the sense of making something heavy or slow like a water-soaked log; functions as a participial adjective suffix.