ironhearted (adjective) unfeeling: hard-hearted, numb
Sinonime: Neptunian, abyssal, aquatic, coastal, deep-sea, hydrographic, littoral, maritime, natatorial, nautical, naval, navigational, ocean-going, oceanic, oceanographic, pelagic, saltwater, sea, seafaring, seagoing, seashore, seaside, shore
Antonime: freshwater