Seaworthy, in the context of marine terms, refers to a boat, ship, or any marine vessel, as well as all their associated equipment and gear, being in a suitable and safe condition to face and navigate the typical sea conditions. This includes meeting necessary operational, maintenance, and safety standards. It indicates that the vessel is structurally sound, mechanically reliable, fully equipped with all aids for navigation and safety, and adequately staffed, to safely withstand the normal rigors of oceanic or sea environments, including weather changes, sea currents and waves. The determination of being seaworthy often entails inspections, certifications, and compliance with maritime regulations.

1. Owen's fishing vessel was considered seaworthy, capable of sustaining the powerful waves and unpredictable weather of the Atlantic Ocean. 2. The refurbished yacht displayed at the marina was fully equipped and seaworthy, ready to embark on long expeditions across the Pacific. 3. After months of intensive repair work, the old schooner was finally seaworthy again, its sturdy frame able to withstand the harsh nature of the high seas. 4. The coast guard won't permit any watercraft to depart unless it's deemed to be seaworthy, ensuring the safety of those onboard against any probable natural elements at sea. 5. Sporting a reinforced hull and upgraded navigational technology, the new sailboat was not only luxurious but also entirely seaworthy, prepared to face the fierce conditions of the Mediterranean Sea.

Fun Fact: The term seaworthy doesn't merely relate to a boat's condition but it also extends to the ship's gear and crew. An important thing to note is that, in addition to the vessel's physical structure and equipment, a ship is legally considered unseaworthy as per maritime law if it is not properly manned or if it lacks the required number of competent crew members. Thus, seaworthiness isn't merely about the sea-bound capabilities of the vessel's structure and gear, but also extends to the preparedness, skill and readiness of the individuals handling the ship. So while the term implies sturdiness and reliability for facing usual sea conditions, it also crucially emphasizes on human capability, reinforcing that a ship is only as strong and seaworthy as her crew.